“Hey, wanna get pizza?” Gar asks, oblivious to the fact that he had just stormed into your room.
Jericho was dead. Killed. It had been very gloomy in the Titans ever since, to say the least. The Titans had left the tower an hour earlier, driven away by Dick's admission about Jericho. Rachel left with everyone else, even though she had little to do with it and neither did you or Gar. Even though you thought Dick would stay, he also left the tower to distract himself from what was happening. Gar remained. Since he had nowhere else to go, you couldn't say that you were blaming him, you had nowhere else to go either.
The tower had been quiet ever since the other Titans left until Gar barges into your room and inquires just about what he did, pizza.