Am I wrong for feeling some kind of way

This is kind of long but I just need to rant and vent. So I just had a baby 2 weeks ago and it was my first child as well as my child’s father. For the whole 9 months of my pregnancy and that we were together I was cheated on, neglected, and put last by him! He cheated with an ex the full 9 months. It was hell. I cried, pleaded, and begged him to do better! Those tears didn’t matter. Not to him, not to anyone! I was scolded by my mom for how I was reacting to him doing me wrong. I was told my hormones were taking over and I needed to “get myself together”...... In so many words my feelings were always being invalidated by everyone and chalked up to be hormonal! As if being cheated on wouldn’t hurt a woman who isn’t pregnant and hormonal.... Anyway...... Now that I’m not pregnant and I’ve tried to give him a chance, I find myself being really cold, mean, and rude to him. I have no respect for him for what he put me through during the pregnancy. But everyone now is on his side and telling me I need to “let it go” and let him try. He called my mom crying this morning and she ended up crying telling me she feels bad for him this that and the other. This was a slap in the fucking face for me. Where were her tears when I cried in her arms due to him treating me poorly??? And all she did was brush it off and told me get my shit together!! I had no type of comfort from her. But she’s teary eyed because he’s feeling like his “Trying” efforts aren’t good enough? I feel some way about this..... I really do!!!! Am I overreacting???