I don’t trust him.

My Husband and I have been married for 3.5 years. I just found out he has been have a affair with another woman for the pass 2 years. He has been taking her out, help to furnish her apartment, helping her pay her bills and by groceries. I can not believe this. I am so hurt and blindsided. He was coming home every night. But would hang out late saying he is hanging with friends but instead he is with her. The crazy part is she knew he was married. They are both dirty and nasty. I don’t know what to do…..