Right? Jean and Mikasa are still here, Gabi hasn't gone anywhere. We're here. Who else would he go with? Levi doesn't have other friends.

[Just sort of assuming that Levi hasn't been befriending anybody here, whoops. But if he did, he would have mentioned them, right! Hange certainly hasn't seen him have anybody else over to visit.]

You'd better not be cleaning everything still. Leave it, he can do it himself when he comes back.