I totally agree with Edgar, unless of course its an "open" relationship...Your never going to trust someone who already cheated, its just that simple. But if you want to stick it out , go ahead be her doormat . But in the case of the thread starter, she holds no obligation man its that simple. Just because you've had sex with a girl or gone on even 20 dates unless something is said(as to commitment) she has every right (as do you) to do whatever you please.