Sorry to hear about this, it sounds just like what my son went thru.
He was dating a girl from school, for over a year and a half. They were too young to be so serious. But he really did love this girl, even thou he wanted to be young and have freedom , he stayed with her. The last few months before they broke up, it was constant fighting, on again , off again. He cooled it with her and they broke up shortly afterward. She started seeing another guy at school and my son admitted it hurt really bad. He decided he would like to stay friends thou.
They had been planning Prom , for so long. The breakup happened 10 days before prom. My son had two girls who were dying to go with him but he choose to go with his ex, at least as friends, and to have a good nite , after all they had been thru.
Right after Prom, things got uglier between them and she has been with about 2 other guys since she broke up with my son. My son just can not understand how she could have changed so much so quickly and now they are not friends at all.
It's all such a long story, and crazy at that. But my son wanted to be friends with her, but after some of her actions and hurtful things said, he just is staying clear , enjoying his freedom , well, freedom to hang out with his buds, and plenty of other girls without being tied down.
I just say go out be young, live, date girls, go out with girls as friends and if something happens between you two then it will, just enjoy your life and let the girls you date know that you are not ready to get married,,,,,,,lol.......that is what I tell my son. He is doing much better over it all and I hope he doesnt get tied down again.