Branch swinger on Quora - so blatant that it might be a troll post:

http://www.quora.com/Dating-and-Relationships-1/How-do-I-break-up-with-old-boyfriend-I-dated-for-4-years-for-a-new-better-guy-of-1-year

I've been dating my current boyfriend for 4 years he's a good guy. Only this other guy who started out as only a friend because I was already taken, is looking more interesting and much more exciting and he's dreamy model hot looking. I've hung out with him for a year as a friend, and he keeps asking me out. They both make around the same salary, everything else is similar.

Top answer is pretty good, excerpt:

With all that said - you've already committed emotional infidelity, regardless of whether you've slept with this guy or not (though if I were a betting man, I'd wager you already have).

You are unfit to be in a relationship with an honest man, and you should do your current boyfriend a favor and formally end things, so he can be free to be with someone worthy of being loved by him.

Go and enjoy your fling with Mr. Dreamy-Model-Hot-Guy for the [X] months that it lasts. And when you discover he is cheating on you with another woman he seduced away from her boyfriend/husband, please come back to Quora and fire up the anonymous question:

"Help!!! How do I get over being cheated on and dumped by a dreamy-model-hot guy/How do I get back my loyal boyfriend of 4 years?"