I recently found my husband with another woman while i was 34 weeks pregnant with our son?

that he talked me into creating. We have been together 8 years and married 5 this yr. i have a 14 yr old and we have custody of his 2 boys (11 & 9) and girl 7 for 6 1/2 yrs...so lukas is our 3 1/2 mth boy. I was betrayed, broken hearted and devostated! I couldn't believe it! i never ever thought he would ever have cheated...but an affair!!!!! and she is 11 yrs younger than us and after demanding a full std testing i found out i now have . i kicked him out and kept the girls he took boys to his parents and shacked up with this *****! come to find out HE set her up in the apartment and was paying HER bills. They were on meth and pills and pretty much anything pretty bad together. we were off n on he swore he was done with her...but, he just got sneakier. Anyways...5 months later we are back together with his promises of all the things he needs to be and should be doing and the promise and commitment from him 100% to me and our family. I struggle still every single day with all the bull **** and lies he has put me through. I'm not sure I can get through or over this, though im trying. Is there any chance that our marriage and family can survive the deceptions and betrayals of my husband and the father of my kids? Am i just naive and foolish to try? or to think he will never hurt me or do anything to betray and deceive again? like **** another *****? Am I being gullible? Please, I need lots of great advice based on "experience"?