I’m on mobile so probably gonna see bad typing and grammar

I(19M) used to date this girl E(20F) 2 years ago. It was my first relationship and it only lasted 10 months but it was the worst 10 months of my life. The first 2 months were alright but after that there was a lot of drama where she was just extremely clingy and would constantly cry everytime she was leaving my house(didn’t have my license yet but she did). She would also talk about how she was always neglected and how no one ever was friends with her for longer than 3 months. Eventually around the 4th month I talked her into getting some therapy and it seemed to be getting better but 2 weeks later it just seemed to get even worse. I would catch her twisting peoples words to try and sound worse than what happened, I don’t even know why, maybe to get pity from me. She would also keep me up until 2am on a school night on FaceTime and everytime I would try to get off of it she would cry and beg me not to go. It all came to a head where one night I was at her house and she talked about how she was cutting herself because I didn’t respond to her fast enough. When I was going to my car after we talked about it she started pulling the “please dont go” and would start to cry. She did this for so long eventually her dad came out to get her back in the house and that’s when I told him that she was depressed but I didn’t tell him that she cut herself. After that night she told me she could barely trust me and it would just spiral from there. She would keep me up even longer on ft, she even told me “I know exactly what to say to manipulate you into staying on longer”. Eventually it all came to a head when we were at my military ball(I was in njrotc, I know it’s pretty stupid). Here she constantly gave me attitude, would barely eat and overall we just left early because she just ruined the whole night. I was pretty pissed and she knew it so I told her we weren’t going to hang out Saturday(day after the ball) and she was not happy. She came to my house to drop off all the stuff I gave her, like stuffed animals and gifts, then badmouthed me to her entire family to the point where they pretty much just told her to cheat on me. I know this because she told me on Sunday. That following Thursday I had my dad drive me to her house where I broke up with her face to face and the next day she gave me a letter calling me a coward and basically bad mouthing me telling me that she should’ve never settled for me. I really wanted to say stuff back to her but at the advice of my parents and other family friends I just let it go even though it kept eating at me. Fast forward to a month ago, I got a follow request from her current boyfriend, I asked what he wanted and he basically just insulted me telling me she was happy with a “real man”(he actually said this I’m not joking) and how I was an abuser and an asshole. I was honestly having fun with it until he called me an abuser which I shut that shit down and he blocked me. Now I’m getting all the feelings of anxiety that I got when I dated her and I really want to tell her how I felt during the relationship. I know I wasn’t the best boyfriend. I was emotionally unavailable at times, I didn’t dance with her at her dad’s retirement and overall I could’ve put more effort into it, and I could’ve communicated better. Now that’s where I ask you guys, the fact that she called me an abuser is really eating at me and I really want to tell her my side of the story and how much she hurt me.