If you thought your girlfriend had cheated on you...

[Mitch Hedberg]

what would it take for you to take it beyond suspicion, and to the point that you would either call her out on it or even break off a relationship of 2+ years?

I'm a regular poster here but don't feel like making this a public issue, but I'm concerned that my girlfriend may have cheated on me. I'm not sure that it was in the sense that she has developed feelings for someone else, but she has joined a sorority and since then has been incredibly secretive and very ready to reaffirm her love for me, which has begun to make me a little bit suspicious, because the combination of the two makes me think that she regrets doing something which might make me question her feelings for me. I would hate to ever think that she would do something behind my back, but I'm beginning to get the feeling that she has done something which she seriously regrets but won't admit to me. It would kill me to think that she had done something to jeopardize our relationship, but at the same time, if she were ever to lie to me about something like that, I think that it would be just as, if not more so, damaging to our relationship.

While I realize that it's pure suspicion that is leading me to believe that she might have done something behind my back, how much evidence do I need to ultimately address her with this issue?