Cheating on me @ 34 weeks

I’m 34 weeks pregnant with my first baby and madly in love with my boyfriend. I found proof that he had sex with someone else when I was 30 weeks. He denies anything physical, just phone sex but I texted the girl myself and she said otherwise.

I don’t know what to do. I love him so much. I grew up in a split household and it ruined my childhood. I always swore that I would never put my children through that. I wanted to build my life with him, but I don’t know what to do. I want to believe him, but I can’t. I want to forgive him, but I don’t know if I can or even where to start.

I feel like I can’t talk to anyone about this. Not my best friend, my mom or anyone because if I do end up forgiving him, I don’t want their resentment to affect us.

I’m thoroughly devastated.