Trudy knew Pete was cheating. She just didn't realize it was with her neighbor. She let him have the apartment in the city so he would keep his women far from home, so she wouldn't be humiliated. (she said this while telling him he was no longer welcomed in their home). It`s how women operate on this show, for the most part. It is an unspoken assumption that their husbands will cheat (although I`m not sure Megan subscribes to this). I don't As long as it is`t brought into the home, so to speak, as long as it is hidden, as long as the wife is not publicly humiliated, the status quo goes on. At least that`s how I read the show.