I believe that it is cheating also. My husband has moved out On Aug 9th, and told me that he is living the single life. WTF?? How do you do that when you still have a wife? I think that is what he is telling himself to ease his guilt, and also so he doesnt look like the bad guy.
But, let me go and find a friend, and he would lose his mind. He still tries to answer my phone, look through my cell phone, and questions where I have been. Does that sound like a single guy's behavior? Heck no. It is all about the guilt, and not wanting to appear to be the bad guy.