Hmm. I agree with vashti. If you're going to stay with her then you definitely have to let it go, but if it's going to be that much of a big deal to you - then you should leave her now before either of you get more involved.
She may have been that person, but who's to say she is now. Think about what she was like when you first met her - did she behave like that towards you etc.
To love is to suffer. To avoid suffering, one must not love; but then one suffers from not loving. Therefore, to love is to suffer, not to love is to suffer, to suffer is to suffer. To be happy is to love; to be happy then is to suffer, but suffering makes one unhappy; therefore to be unhappy one must love or love to suffer or suffer from too much happiness. I hope you're getting this down.