Should I ask her.............?

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Wow, I'm so sorry, two days down without an answer, =(, anyways... I'm going to tell you my opinion, feel free to listen. I must admit this, I am extremely different from everyone else, have never had a girlfriend, at all, ever, and never had a first kiss or anything. But my knowledge, on these subjects can be superb, I study neurology, and psychology. Anywho.... It seems like he's probably cheating, but that's what anyone would say, if we investigate further, he might be telling the truth, maybe she's a little messed up, it's possible, anyone can be overly emotionally attached to something to try and ruin someone else over it. On the other hand, he might have cheated, and went to her to say she never hangs with him, or whatever. I mean, how much do you love him? He might not be the right person, as much as you think he is, if someone can't be proven to be telling the truth, they aren't quite worth it. You probably haven't quite found the right person yet, I know it sucks to hear, and I won't say there are plenty of fish in the sea, because there are few people that work with each person. We're like puzzle pieces, we only fit with a few, and only one that we fit with, will successfully connect with the rest... I'm sorry, I'm probably not answering this well D=, anyway... I believe that he is doing what he sees as right for him, but not thinking how it would affect you, and this doesn't make him a bad person, it makes him, a homo sapien. I think you just need to let go..
-To directly answer you, yes, ask her.
--Go ahead and add more info to your question to respond to me... I'll reconsider some things from there, and so on, till I've successfully helped you. =)....