I broke her heart and lost her but now I know she was for real

I dated this girl for nearly a year and then for some reason I began to treat her badly. I stopped making her feel beautiful, she said at times I even made her feel ugly. We fought and I allowed it to go on instead of just showing her love. Sometimes I created fights so we wouldn't have sex. The no sex thing was the worst for her. Then I broke up with her and she spent the next 5 months trying to get me back. I said no to her everytime. We started being friends with benefits and the last time I was her, the sex was all about me, I didn't try make it great for her at all. She cried so much over me and then eventually moved on and started dating again. She has been with this guy for about a month and everyday I miss her more and more. I know in my heart I love her and I can treat her so much better, they way I did that made her fall in love with me. I want her back so much because we shared a special bond that had a shot at being called true love. If I never have her back, it will be such a huge waste of something so beautiful.

My question is this, should I let her be and keep my distance or do I fight for her knowing that I value her so much more now that I have felt the pain of losing her.

Hi you could let her know how you feel, then she can decide from there but only if you truly want to treat her right not just because she is with someone else and this gets to you, I treat my ex like a king and he was on weed drinking to much neglecting me then finally went off with someone else. I hoped he would miss me but this does not seem to be the case and we were together 4 years, and i can tell you i would forgive him and take him back but only if he truly loved me and was willing to work as a team not just me putting in all the effort. Let's know what you decide