I dated a girl for two years, broke up earlier this year, and remained friends. It was actually sort of like we were still in relationship because we hung out just as much and still had sex. Eventually, I decided to try to date other girls because my experience with dating is very limited. I had to put in a lot of work just to get dates with girls who turned out to be awful compared to my ex. My ex noticed that I started going on dates, so she met a guy through her friend and started dating him. She started spending all her time with him and it felt like we had finally broken up, which made me pretty emo. I told her I wanted to date her again. She said she wanted to date this new guy. The next day she had sex with him for the first time. The day after that she came to me and said she wanted to get back together too. But, I'm not sure I'll be able to date her now that she's fucked another guy. I think it would eat away at me. What should I do? I don't think I could find another girl like her...