Bastian looked at Harry and reached up to touch the side of Harry's face. "It's not that I think you're going to up and leave..." he explained after a moment. "I just... I almost lost you once. I don't like the idea of putting you in danger..."
He knew that simply by being who he was Harry was in danger in this country. There was very little he could do to fix that. Since Harry's attack though there had been some underlining fear every time they parted that he might find Harry in some alley again, beaten and broken. He wanted to protect the younger man from that and he wanted to keep him safe.