Been Piecing Now Relapse with OW?

[summerd]

My husband left emotional affair with OW and career of 20 years to move back home with us nearly 2 years ago. I just found evidence today he has had contact with her again beginning in September. She has apparently left her husband and is living in our area. I've said nothing so far. Not sure what to do , how to react. I feel numb. Things had been pretty good with exception of last few weeks - likely time frame of contact. Then - familiar comments - questioning relationships, marriage, monogamy. All of my actions and responses have been to love and love some more. I don't know what else to do. But right now, I feel as though I need to move him on. Any advice?