"I know that." Don't take him for an optimist, Saix. Roxas expects most things to go badly for himself.

"This one's up to you, though." As far as Roxas is concerned, it's Saix's choice whether or not he changes. If he decides to keep being a total jerk, which is most likely, then Roxas won't be so accommodating in the future. But he's got to let him make that decision first.

He makes no move to follow. It's not like he exactly wants the other's company. But he'll probably be headed home after this, just to make sure he doesn't try paying Axel a visit there.