If she's as interested in cheating on her current boyfriend, she isn't going to be much less likely to cheat on you. Calmly explain that you're interested, but that she needs to end one relationship before starting the next, or the kind of relationship you want just won't work. If she can't do this, then walk away; she's not ready, and things would only end with a lot of pain on all sides.
Kudos to you for refusing to be The Other Guy, by the way.
Complexity is not depth. Machismo is not maturity. Obsession is not dedication. Tedium is not challenge. Support gaming: support the Wii.
Be the ultimate ninja! Play Billy Vs. SNAKEMAN today! Poisson Village welcomes new players.
There is much to hate about modern gaming. That is why I support the Wii.