Maybe you can talk to him. If you take the approach that you experimented with other girls and you don't see anything wrong with him being interested in other men - but you do have a problem with him acting on that interest. Make it clear (if I understand you correctly) that it isn't his orientation that matters, but you expect him to not cheat on you (with men or women).
Maybe you can find out what he really wants. Its possible that he would be happy if you did him with a strapon occasionally - don't know if you are OK with that. It may also be that he wants to be with an actual man - in which case there isn't anything you can do.
How is the rest of your relationship and sex life. If this is the one problem and otherwise things are wonderful, then its worth putting real effort into trying to find a solution. If this is just the last in a long string of problems, then maybe you would both be happy apart.
Its always difficult to provide suggestions here: words just can't convey a clear feeling for what is actually going on, and its easy to map situations we are familiar with onto someone else's words.
good luck
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