What reason did you have to check on him to find the e-mails and texts? How defensive is he over them "just being friends"? I don't think that asking to move out is necessarily a big mistake, obviously you felt you needed to. You just need to ensure somehow that he is still upholding his end of the bills, in or out of the house. If he is going to continue having an affair, whether it be emotional or physical, you don't need to be seeing it happen right under your nose. That is completely disrespectful, so don't worry about his moving out right now. That can be worked on in the future.
