My husband is a douce!

Tiffany • About to get divorced with two children and prego with baby #3 eta 6/17/15
Welp I'm 4 days away from having my precious little boy and my husband went out to celebrate his birthday mind you he has had several problems with infidelity and has only been back home about a month. I'm so over this that I can't even get mad... I'm not sure how to come out of this hole we are in and he claims to want to work on us and get better but my trust is shot to hell and I'm almost at that "idgaf" attitude about my sham of a marriage... I can feel myself asking for a divorce after our son is born... I wish I knew how to help fix this any advice?