That's definitely not what he wanted to hear, even if it's merely a confirmation at this point. And this guy's been elsewhere before even all this? "...by yourself?"

He's not sure what Keith's circumstances are. Maybe the guy's used to operating on his own. Donnie may hermit himself away in his workshop at times but he's never really been 'alone' much less apart from his family, his brothers especially. Not for that long. It's hard to even imagine how that would be but he starts feeling a little queasy about it as he tightens his arms around himself.