Update:
Firstly thank you all for the support, and the advises. *Hug*
I did realise that I was a bit, if not a lot paranoid. I talked things out with her. Actually when she would "ignore me" she would be doing normal things like eating, drinking, using the bathroom or just relaxing.
I realised that when would say "only you can help yourself" is practically true. I started training more, drawing and using my guitar more. By that sentence she kind of told me that for psychical health you need to have physical as well. By me focusing more on gaining weight and being more healthy, more strong and focusing on my art and guitar I think less of everything else.
She doesn't mention the guy as much. Even if she does she would say "Oh, I truly am sorry" so that has been good as well.
She loves being social and having a lot of friends, she is just friends with the whole city, which I am an introvert, I am not used to it, but she is and I am willing to try.
She finally admitted that happiness is real and that she is closer to it when she is with me, which makes me happy.