Well, he definately has potential / desire to do so. Whether he has cheated or not, that I can not answer.

well if he says that he would, doesnt mean he would, but ok i think you should tell him how u feel and see what he says. but iv had issues with my other half and once you start thinking that is he cheating it causes a major communication barrier and does cause fights so its best out in the open hun.
hope it works for you