Ex had sex with the first guy other than me
We met when she was 15, I was 16. Took the v cards, and stayed together until 3 months ago. I am now 20 and she is 19. Basically 3 months ago she broke up because she said she wants to have fun and be single. 2 weeks later she wanted me back, I said you can't break up with me and get back as you please, so no. for the next 3 months it was basically a contest of who cares less, and we had sex twice within the time frame. 2 weeks ago she had a new boyfriend, and yesterday told me she slept with him. I feel betrayed, hurt, angst, and misery. I told her we could never be again, and she ruined our bond (only having sex with one another) its so painful because it was my first, and only, and it lasted for 4 years. My friends say its unrealistic to think you two were only going to sleep with each other forever, cause were both very attractive people. She was hurt by what I said and asks me to hang out, but I want no part of it, I feel like there's nothing special about us anymore.
Thoughts, concerns, advice