"Your dad didn't come back, huh..."

Tamaki wonders if that was a conscious decision on Greg's part, or just something that... happened, like the way Mitsuki went home and left Tamaki here. He's not entirely willing to give Greg the benefit of the doubt after what happened at the celebration, and doesn't entirely have the self awareness to realize he might just be projecting.

"Is anyone else from your world still here? That you can stay with?"