Cheating Husband!

Dear morning crew,

I've been with my boyfriend for six years living together he bought a house and we started going to church. He and I got married and were married in that church to a Luther song, so amazing. Three months into the marriage my husband started to cheat on me with a 24 year old woman who is the same age as his daughter. I found this out New Year's Eve, he left me to be with her. The next time he told me it was the churches fault we got married. He blamed it on God and stopped going to church. Well now, four months later Little Miss Sunshine is gone. He's back in church and needs my help. I still have feelings for him but the trust is gone. 

Part of me wants to leave. 

What sure I do?