Most Helpful Girl
One Bad for Another Bad does not make anything Better. If you choose to do this, it will only create an unhealthy form of trust. Sure she thinks its OK, but its still not Right. You chose to take her back every time becasuse you love her that deeply. If you become like her by breaking trust and cheating, then who will be the strong, stable, forgiving one?
If you want to cheat, maybe its because you never forgave her from before. Just because you took her back does not mean your heart forgave her. This feeling that you want to cheat, and the fact that she'd be OK with it - is already NOT healthy.
Forgive and Forget but only if she's willing to STOP Taking advantage of you and your generous heart...otherwise who's to say this new girl wouldn't treat you better? You never know what possibilities are out there, but at least be respectful and true to yourself. Either you are in love and you want to be with your girl, or you cannot get over her cheating and its buggin you inside and you want to act out.