I stayed...

Anyone out there ever stayed with cheater and you just can't move past it? Basically my friend told me that since I'm Christian I can't get a divorce. The cheating happened before we got married, he told me after we were married, then it happened again and again. Now he's been talking to this girl named ava from work til 4 am in the morning almost everyday. I pretend I'm sleeping and glance over and see her name. We have a 1 yr old. I don't want to go to hell for this but I think about how everyday I sin and how is getting a divorce any different?????