He cheated and I can’t forget

When I was three months pregnant I found text messages from my partner and another woman. The messages talked about my pregnancy, so she knew about me and the baby. He would say stuff to her like, “how is the love of my life today?” They never meet in person. She lived out of state and he in Texas. It was only through messages and all platonic. We weren’t living together at the time and sometimes we would barely talk. When I found those messages I confronted him and called her. He immediately broke things off and blocked her number and Facebook account. He said he would never hurt me again and to let him prove it. He said it was meaningless and didn’t feel a thing for her it was only entertainment because things between us weren’t good. He said he never meant to hurt me and truly loved me. He begged for forgiveness and to think about our baby on the way. But whatever decision I came to he would still be there for the baby. After a while we reinstated the relationship. He was there throughout the pregnancy, he was there when the baby was born, he gives me money and provides. I have full access to his phone and he doesn’t message women and rarely gets on Facebook. However, any time we fight I bring up how he hurt me when I was pregnant and cheated. He never saw this woman in person but him telling her about us and texting and calling each other for three weeks to me is cheating. How can I get over this? He says if I want things to work I have to move past this but I can’t. Honestly, I think about it almost every day. Someone please give me advice. We have a 2 month old that needs us both but it hurt so bad I just can’t get over it.

Uodate: I’ve asked him several times. Sometimes even begged for him to tell me why he did it and he always says he doesn’t know. I do have full access to his phone and do check his Facebook. He seems to be sincere in that he will never do anything like that again because it’s been 9 months since that happened and I’ve never seen him messaging women. He is always at home, work or with me and the baby or his daughter