I am probably one of the worst people here to give advice on relationships, but...So there is no winning this.
If I am the sweet guy, she'll take the guy who ***** her in the roughest way possible.
If I am the other guy, she'll look for a sweet guy to take on the side.
I guess the conclusion is simple: as soon as you detect such behaviour, dump the ****.
Yeah pretty much what you said. We're screwed.
UNLESS you can find someone who is different.
I have said this before, but from what I have observed, genuinely religious people do seem to have pretty solid relationships.
I am sure it is possible without being religious, but it seems to me that it is most common in that realm.