If you don't leave her, she will leave you eventually.
You have more chance to get back at her if you leave her first. At least you show her that you have control on yourself.
And when you leave her, tell her that sha has been disrespectful toward you and you can't accept that.
Say yes but she has to be willing to allow you to fuck other women. If she says no, then no deal, if she says yes, start going on dates asap and watch that bitch get jealous and insecure so fast. If she realizes you could replace her in a flash she'll change her tune asap. I'd say at that point just keep fucking whores and dump her stupid roastie ass.
Wait a minute....