How Missy can turn this back on SOBO is a bit disturbing, not his fault shes capable of being a two-timing tramp. You definately gotta end it before she does bro, otherwise you're gonna feel really like a loser. But you're not, this is just a bump in the road and eventually you'll look back on it and think about how this one experience made you so much tougher. Noone will ever be able to toy with your heart and emotions like that again, your wise to it now. Like I said just work on getting back to a normal mindset, read some Tony Robbins books or something. She may not be intentionally trying to hurt you, but she's so selfish it's not even crossing her mind. And that is what you need to focus on, how much of a selfish person she is. Now it's your turn to be selfish - bang her once more and tell her to get the hell out. Be a total prick with how you go about it, letting her know just how you feel will lift alot of that anxiety and maybe even have her wanting more (some women are freaky like that). Of course if you want to exact revenge on the other guy, I'm also here for ya, plenty of evil thoughts running through my mind at the moment (and her too). Remember you're innocent here, theres nothing you did wrong and if she tries turning it around on you like Missy did, (women are famous for it) just go off, scream yell let it all come the fuck out, say you're gonna give this guy a piece of your mind (even if you don't it'll have her thinking). It's gonna hurt alot more if you internalize all this.

Remember 99% of all women are about themselves, the only way to counter this is to be 100% about yourself. Sorry SOBO, it's a shitty hand to be dealt but like I said you'll be alot stronger from it.