No, we don't all cheat. Quite far from it. It might help if you don't start off your OP with such a blatant generalization.
Maybe you're doing too much to make her happy, and she's the type who doesn't like that.
Or something along those lines. How about communication? Not confrontation, but actually sitting down and talking with her about exactly what is going on underneath her actions. People--BOTH men and women, thanks--cheat for all kinds of reasons. Some of them are valid, some are not. But you're never going to find out why if it's all about confronting her instead of digging down deep into the relationship with her (whether or not you stay together is a separate issue).
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And think not you can direct the course of Love;
for Love, if it finds you worthy, directs your course.
--Khalil Gibran
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