You might want to have a conversation with the party doing the cheating to make sure that they are not involving you in the way of excuses, i.e., they were with you or over at your place or went someplace with you. Unfortunately, I was unaware that a friend of mine at work was cheating and was telling his spouse that he was hanging out with me after work when in fact I was working overtime on a special project. His wife called me one evening and really layed into me and finally learned the cold hard truth.l