Please don't take my following bluntness in anything but love.
He did
NOT treat you well.
He lied to you for years. He took your trusting and naive nature and used you. He wanted to have his cake and eat it too. It has been said by another poster or two that you don't know for sure that he hasn't cheated on you with other people, and you should
seriously take this into consideration. Someone doesn't wake up one day and think, "ya know what? I think I'm going to have an affair of some kind." An affair is thought about, planned, plotted. There had to be conversations and decisions made to have the affair. Even a one night stand... that's planned to some degree. The person who had the affair had to purpose in their heart to do so. They had to be okay with the sexual sin. They had to make the justification that it was okay to cheat on their significant other. Planned.
The affairs are always planned.
Your pride is damaged, I get that. I soooooo get that. I had a very public breakup when my ex and I split. He was a cheater, so I understand the whole "I'm going to forgive him and stay" thing. But I found out he was a serial cheater, and the relationship ended at that point. So you don't want anyone to know. Honestly Nicky, that's just silly. You need help and sooner or later, the church is going to find out. I'll bet you a shiny nickel that the chick he cheated with will probably let it "slip". Because she's unrepentant, because she's called you names, because she blames only your husband, because she's walking around with a smirk, because she's still coming to church, she's not only
proud of herself, but her designs on your husband may extend past sleeping with him.
The best prediction of future behavior is the past. It's possible that your husband means that he won't cheat again, I can't say for sure. However, you cannot continue to turn a blind eye to your husband and marriage. You need distance, like Misty mentioned. You also need Godly female mentors like Mystdancer said.
I would also advise individual counseling. I know how the questions pop up about yourself, the other woman, revenge, etc. Going to see someone to talk this whole thing out
by yourself will be very beneficial. Your husband also needs individual counseling because of what he's doing (and has done). Go seperately, and I would recommend going to an actual therapist, not just your pastor. Most pastors only get a class or two in psychology and martial counseling. Going to a lay counselor, a marriage family therapist, etc is probably the best thing.
If you ever need someone to talk to, feel free to PM me.