Got the sneaking suspicion that your guy doesn't only have eyes for you? You deserve better than a dishonest dud! Forget that he's super cute and charming -- guys aren't "Irreplaceable." (There's always another one waiting around the corner!). Not sure what his deal is and don't wanna overreact? Short of finding another chick's panties, there are telltale signs of cheating. Peep our "cheat sheet," and get the deets!

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