What the hell is wrong with me.

Quick backstory

I was sexually molested from age 6-13 by an uncle.

Sexually molested 11-16 by my step dad

I have been sexually active since I was 14.

I’m now 21.

I have cheated on my SO 4 times.

I really want to change and I thought I would after having a baby. I was faithful to him for a year and 6 months straight recently until yesterday. I kissed another guy. I know my past isn’t an excuse for my actions but I just want to know your opinions. Why am I like this. I truly do try to change. Could I be a sex addict? We have been together for 5 years. 3 guys were by having sex with them and the one from yesterday was just kissing.