Tartaglia

You and Tartaglia don't get along; you've always had disagreements over tastes and such.
In school, he often played pranks on you, and you did the same sometimes.
Your parents were friends, so you and Tartaglia live in the same apartment, and you are both 17 years old.

You go out onto the roof and see this scene: Tartaglia is sitting alone, and by the looks of it, his girlfriend just dumped him.
What will you do?