I am having a problem?

My husband cheated on me and lied about it for 4 years. He confessed about two years ago. We are working the issue and going to counseling. But...it has taken a toll on my spirituality. I was such a strong Christian before this happened and now I'm angry and bitter. The "other woman" was someone from our church. She doesn't go there anymore, but I can't seem to sit in the pew on Sunday without terrible thoughts going through my head. I haven't had my devotions or daily prayer time in 2 years. I'm not mad at God, but I can't feel close to Him with so much bitterness inside. Please give me some advice.