Good clue. To be honest I can only think of three ways to find out.
1. Ask mutual friends that you are closer too (than him).
2. Spy on him.
3. Directly ask him. I think that no mater how you phrase it or what he might think it may be something that must be asked. Becasue the longer this goes on the more it hurts you and that's not very fair. He may be hurt if you ask him directly, but if he really cares and you state your reasons why you think he may cheating he should address the issue. Just ask why he never hangs out with you anymore and if he gets really defesive or aggresive it's a good clue.
I'm no expert, but that's my scrambled advice.
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