"I'm not going to promise to not disappear. You're smart enough to know we don't control when the ship does that." Because otherwise a lot of people would have stayed to take care of the people they loved.

He might not be able to tell where the fear was coming from through the weird ship thing. But where else would it be? "What I am going to promise is that as long as we're both here, I'm going to take care of you. For as long as I possibly can. Because I love you."