How to cope

So a couple months ago on July 4th I found out my bf was apparently planning on cheating on me with a bitch from work. Normally I don’t go and call the female names because they don’t owe me anything as far as my relationship goes but in this particular situation her ass knew about me and my pregnancy. I was about 20 weeks along at this point and I saw an email thread where they were planning to meet up and have sex while I was away on a business trip. When asked why it didn’t take place he stated that he knew it wasn’t right so he chickened out. I ended up emailing her as well and she stated that nothing took place and she was the one who told him it wasn’t right which is why it never took place. She ends up filing a sair at work which got him moved to another building because she was so upset that I found out supposedly and emailed him shit like “this is why I told you no” blah blah blah. I’m like but the whole time you knew he had a fam and you still wanted to go forth with it so don’t act all pissed now! My daughter will be here in a couple of days and I guess I’m just trying to move past the situation due to the fact that he has followed my request of taking a lie detector test (to prove it actually didn’t take place) and going to counseling etc but I just can’t move past this..