38+4 and just found out boyfriend is cheating

38 weeks, 4 days, we're supposed to have a c section the 7th, 6 days away. And just found out my boyfriend has been cheating. He hasn't actually seen the girl. (She lives 5 hours away) it's an ex though. They've been talking everyday. And planning their life together, her even saying she will raise my child. (I won't ever let that happen) and now he says he's sorry and he had cut things off with her before I found out. So do I forgive him? Or forget him? I love him so much and I've done nothing but cry for two days. My life is planned with him, we share a home & he is my world. Please help me ladies. I'm a first time mommy and I'm so close and I want nothing more then for this to be a happy time in life and yet I will broken, weak, and so many other hopeless things.