Words of wisdom

Just please, I need words of wisdom. Some sort of inspiration... It's going to be almost a year that my ex and I split. I found out he was cheating, and i just had our first baby. We were together for 9yrs, I decided to leave. Hoping that he would miss me, us as in my baby and I. Instead he chose to stay with his mistress.. And I can't seem to shake it off. I cry at night, wondering how can he do that. I simply loved him, imperfections and all. He was so quick to replace me. I feel like I failed as a mother, not having that family. I failed as a woman, not being able to keep my man.. Like, What's wrong with me. I'm tired of pretending to be okay, especially with him. When I'm really not okay at all.. I'm tired of being hurt, crying. Wondering why I wasn't enough. I thought he loved me.