"He was worried about you." A beat. "Believe it or not, the reason I came along was because I was worried about you too. And - you know - to lend an ear if you wanted someone to talk to." He grimaces a bit. "Guess I'm not very good at going about that."
He never has been, really. Especially with people he's more used to bantering with.
And that's as close as you're going to get to an apology, Spike.