Just get it out into the air: yes, Jason is being petty. Yes, the breakup was months ago.

Jason's big on self sabotage and stuff. Sue him.

The costume party sucked til he saw his ex. Okay, then it sucked less. Still sucked, but a pretty face (and someone he loves personality wise, he's not all shallow, mind you!) makes it better.

Then he saw the flirting with another party-goer.

Time for Jason to work his magic.

He's stealthy when he moves across the room. Quiet, he leans down to his ex's ear.

"Look at you. Having fun?" Jason doesn't wait for an answer when he adds, "This is fine. I don't care. But if you're going to go home with this guy, keep in mind, my doors are closed."

With that, Jason starts to walk again.