I'm 23 and need some advice about relationships. I've been on and off dating since I was 16. All my past relationships ended due to the other person mistreating me. After all these years I've decided to date someone in my age range and someone with no kids. By far this has been the best relationship I've had but I'm kind of starting to having some doubts. Now we agreed to having a open relationship which that hasn't the doubt that I'm having. My bf is 24 and we are currently in a long distance relationship after I moved back home to support myself, because I wasn't able to support myself financially living out of town. My bf was adopted and didn't have the best childhood, over the course of years he found his comfort in gaming and other things he likes. We both deal with mental health issues. We been dating for almost a year. I've been in 2 other relationships that lasted a year and no longer than that. My first doubt is that I think I'm not cut out for relationships now I've started to realize I never really took time out to heal from past relationships and even past trauma. Whenever I try I get about 2-3 months into the single life and start to feel lonely and hop into relationships. Now I don't have everything in life figured out but I'm doing what I have to to get by. My bf on the other hand isn't quite like that he works and he spend his money however, there are multiple times I have helped him out when he's short on something. But these last few months he's been trying to do better. I don't regret anything I've done for him because I do it from the love and the kindness of my heart. But my second doubt is that we stay together for a long time and he never gets a hang of himself not only financially but mentally. I do believe in growing and building together, I've just been in so many relationships and have relations with people and every single person used me. I don't believe he's using me I just fear that I'll be taking care of him the rest of my life if we stay together. I do plan to go on a self healing journey but he doesn't want to break up.

I've just wondering if I'm wrong for thinking this way or just looking for any advice. (If you're going to be mean pls keep your advice to yourself.)