What to do.

So, I met a girl I've known for four years going on five now. We liked eachother when we met and rated once My dad moved out of the same neighborhood and we started dating for the first time we couldn't do anything but text, a "friend" got between us and she wanted us to fight over her and then she left me for him because wut was a "prank." Found out They broke up few days afterwards after I wished her a happy birthday. He didn't even remember hers.

then we got back together again only for her to cheat for some guy who didn't even live in our area, she sent him things and got her phone taken and we stopped communication for about a year.

soon afterwards we reunited my sophomore year and dated but this time we were happy because my step mom said she'd bring her over on my dads weekends so we could be together and get closer.

well a while after that an ex of mine got in the way, my friends beatrayed me claiming I was cheating and we broke up and she dated another one of my friends who I fought my whole junior year until the summer. My step brother sent me a screen shot of her claiming she missed me so after work I drove to her place to see her and we ended up kissing. Then she cheated on the same guy who was my "friend" that I hated very much because he was using her against me. i confessed that I didn't want to lose her anymore and I wanted to be by her side forever and that I loved and missed her dearly. She told me she wouldn't leave me ever again. ( there's more to this.)