OP, a few things.
1. I don't think her being a cam model is relevant to any of this. You didn't meet through a camsite. She straight up told you she didn't want you to go to her cam room. You met through a dating app and none of the issues you've had with her are connected to her status as a cam model/sex worker imo.
For example, these two things:
On some days she told me how bad she feels and how worried she is, like her vibrator broke or how much debt she still has. But she never asked for money or came back to the same problem / topic.
- For her it would be a great opportunity to go out, getting a free meal (saving groceries) each date and having a fun time, while on the long run if her dates like me catch feelings she might can profit of it
Neither of these are exclusive to cam models/sex workers.
I've seen it countless times on this forum where a guy brings up how a cam model complained about her finances, and even if she didn't ask for money, he still thinks it is a covert scam where she's playing mind tricks so that he can give her money. Then has the nerve to claim she's a friend or that they care about each other. Like sure, maybe sometimes it's some kind of covert money grab. But honestly, friends complain to friends about money. If I have a big, unexpected bill come up, I'll bitch about it to someone I'm close with. It doesn't mean that I want them to pay that bill or give me money, just means I wanted to vent.
And for the second one, I've had quite a few friends irl, none of who ever did sex work, who used dating apps simply to get free meals. Or used dating apps so they could find a guy who they could date who would then financially take care of them so they wouldn't have to work. It was actually kind of common, where I'm originally from, for women to want to find a man who would be the sole breadwinner so she could be a stay at home girlfriend/wife/mother. And vice versa, it was pretty common for the men to want to find a woman who would keep the house tidy and have a hot meal cooked for him when he got home from work. This is mostly because oil rig/refinery jobs are pretty common and those guys make really good money, but they also work insane hours. But I digress, people using dating sites to "profit" in one way or another isn't exclusive to cam models. People just prefer to not think about the transactional aspect of a lot of relationships.
2. I'm not trying to be an asshole by saying this, but I think you're the main problem here.
I was 100% honest from the beginning, I was only short term there and I told her I wanted to be friends, but no long-distance relationship and I didn't want us to be needy for each other. I wanted her to date other men and I was worried that she might feel too much for me.
When she told me about her job as a cam model after I left and that she basically has a very sad life, I felt so bad that I couldn't think about anything else but her. So I fell in love
You told her in the beginning that you didn't want anything serious and that you didn't want to do long distance or to be needy. You completely flip flopped on that. Sure, there's times when a fling or hookup situation can turn into something more serious, but I know for me personally, if a guy tells me right at the beginning he doesn't want a serious relationship, that's how the relationship gets categorized in my head from there on out.
I also think it's concerning that you "fell in love" only after she told you about her life problems. If you had said that the two of you had such an amazing time while you were physically with her, that it was so fun and romantic you couldn't help but fall in love at that time, that'd be one thing. But, it seems like you were more in love with the idea of being her savior than you actually were with her.
I noticed how my confidence got completely attached to her "love"
I mean I was obsessed to some degree.
All of this is extremely worrisome, and indicates there's problems that you need to work on within yourself that in the end, don't actually have anything to do with her. Healthy, stable people don't get to this level over someone they went on a couple dates with and slept with a few times. I'm sorry to say this, but if it wasn't with her, there more than likely would have been another woman that would have brought about these same issues within you. Keep doing therapy, but instead of focusing on her, focus on you and how to not fall into these same pitfalls.
Even though she told me not to go to her cam-sites, you could find her by googling her whatsapp profile picture and most other pictures from her social media. At one point I even admitted that I found her profiles and she guilt tripped me again.
I went to her cam-sites sometimes, not to be a fan or customer, but because I was so trapped and of course, tried to find some truth or control
This is extremely fucked up. You disrespected her boundaries and invaded her privacy. Not everyone realizes that their cam persona can be found if they use the same pictures on their cam sites as they do their personal social media sites. A lot of cam models don't like to mix their private life with their work life. There's safety/privacy issues as well as the fact that it can just be plain uncomfortable knowing that someone you know irl is watching you while you work. Honestly, I would block anyone in my personal life if they disrespected my boundaries this badly.
3. Sometimes people do things that we don't necessarily understand and we may not ever understand. Instead of wracking your brain trying to figure out "why did they do this?" instead think "why am I reacting this way?" The answer to the latter isn't always so cut and dry like it may seem. But, I'll try to help you understand some things.
Also some emotional black-mailing. I said "if we want to be friends I need to get my feelings for you under control". She said "yes". I said "I don't know what to do, I should take a break (contact) to get my feelings under control" and she said "You know it better, if you take a break again I will block and delete you everywhere".
I wouldn't say this is necessarily emotional blackmailing. Sorry, I'm really not trying to be an asshole, but give blunt and honest feedback, you seem like you came off as extremely needy, which can be tiring and off-putting. The fact that she said "If you take a break
again" makes it seem like you brought up taking a break multiple times before. I'd respond similarly to how she did. I can see how that comes off as a threat, but honestly, dealing with someone who constantly needs "space" or a "break" is exhausting and I'd be like "Okay, do it. But, I'm tired of this back and forth so it'd be better for both of us to just cut contact completely". I know some people may see that as immature, but honestly, I think it's more mature to completely cut ties when a situation becomes toxic than to keep some avenues of communication open.
I could not understand how she disposed me so quickly after I thought I was important to her and she was so important to me. And that is messing with my head a lot.
Things just happen this way sometimes. No matter how you met, the circumstances surrounding the situation or previous feelings. Like I said in the previous paragraph, when some people are done they just want to be completely done and move on.
And for my final note:
When it escalated in the process of me being discarded she told me "you should have worked harder on controling your feelings. I don't know if we ever have been friends."
I 10000% agree with the part of that quote I bolded. It doesn't seem like you were actually, genuinely friends with her.
She started off as someone you met on Tinder while on vacation. You went on a few dates and slept together. You told her that you didn't want a serious relationship, that you wanted her to date other guys, that you didn't want her getting too attached. Only after you left and she told you more about her life problems, you "fell in love". You became "addicted" and "obsessed", per your own words. You say you cared about her, but it seems to me like you cared more about the way she made you felt (or could have made you feel if you were able to "rescue" her). I think had she been a happy go lucky girl with no big problems, or if you had been able to "rescue" her in the way you thought you could, you would have lost interest.
I don't think any of this makes you a bad person. However, I do think that you need to work with a therapist to find out the root of these issues, work on your savior complex, so that you can eventually be in a happy, healthy, non-codependent relationship.