forgive and forget?

Sergei said to his pastor, “It’s been 2 years since Danica cheated on me, and I still can’t get past the hurt. Some days I think I’ve moved on, but the pain is always lurking beneath the surface, ready to explode in the most unexpected moments. We can be having dinner in a restaurant, and sorrow and anger washes over me and I feel that I despise her. How can I forgive if I can’t forget?”