[He moves to drop his hand, taking one of hers and giving it a gentle squeeze. He's always known they'll go back to Weblin, that there's still things left to do there.]

Aa. [...] It's painful to think about, isn't it?

[He does think her going to her world, going back to her friends, is the best thing, so why is there this conflicted feeling? Is this what Mary's feeling?] But... There's a chance that that wouldn't have to be the case either, isn't there? [And maybe that's why he says that--even though he thinks the possibility is real as well.]