Just saw this post from our darlin' Starsky over in Defacto's thread that is very, VERY applicable to you as well.
Originally Posted By: Starsky
How much keen strategy does one need to follow the basic laws of human attraction? She cheats on you, you pull back and establish your boundary, and she seeks to reattract you in order to get back the power equilibrium. It's basic "push-pull" dynamics, and she doesn't need a degree in quantum physics to play it.