Fabulous queer dating tip #20: It's all his fault.
If you're having an affair, make him feel paranoid for thinking that you might possibly be doing what you are in fact doing. Once the truth comes out, say that he somehow drove you to it. For instance, if you have an affair while your partner is in university, then the fault obviously lies with his choice of university, since otherwise you would never have met your new honey, right? No, I am not making that up.