I believe the reason she is acting that way is guilt!! She knows she messed up and her head is spinning on what to do next or what your gonna do next! She messed up end if I were you I'd end it, that is the lowest of blows. I feel your pain I've been cheated on many times but if you let it slide It will continue. Don't be the weak one, trust me. Be strong!!!!!! Do it for you.