Perhaps the two of you should go to couples counseling to work on your communication? Can you give some examples for why you feel he isn't hearing you? From my end, cheating seems like an extreme "solution" and yet he still didn't react the way you wanted him to. What kind of reaction were you looking for? Did you want him to leave you because you don't want to be the one to walk out on the relationship?

I'm sorry I don't have much advice for you. I truly feel that counseling to work on your communication skills is key. I also think you need to figure out exactly what you want from this relationship, or if you even want to be in it.