1) Well, you're both young & single; no commitment from or given to either of you. 2) "Cheating" is a somewhat vague term. Do you think he has taken another gal out to dinner? To a ball game? To his or her bedroom?
Girl, ALWAYS trust your gut! Usually one doesn't just pull CHEATING out of thin air, if your thinking it chances are he's probably left subtle yet REAL clues he is! Like stated already... 1)find proof 2)hit him in the face with it... literally! Good luck sweetie.
Why do you think he's cheating? And unless you have proof and know for sure you know he is going deny it. So the best thing to do is pull back a little. Keep some space. Do things with your friends and family. Take a breather. See how he reacts. He may be innocent and just need some time to himself.
i was a cheater if I had to do it all over again I would not ever. if you think he's cheating , he is , or he wants to. if you want to stay together you have to change but you have to communicate about the specifics
If you think he's cheating, he probably is. Your decision is what your going to do about it. If the relationship has run its course than move on. If you want to save it find out why he cheating and try to correct what happen. In my opinion once a cheater always a cheater. But you have to do what you think is best.