Smart move letting the person who won't shut up go first. Though Strange nods at Steven's question. Because he's right. There is a lot Steven doesn't know about him, just as there's a lot that Strange doesn't know about Steven. And maybe, just maybe this is as simple as his problem with Peridot and learning about each other would solve everything.

"Well, this one's fairly obvious: I'm married. My wife's name is Arabella and I miss her terribly." At least, it's fairly obvious to anybody who talks to Strange for a certain amount of time. He doesn't really shut up about Arabella. Still, that's possibly the biggest and safest answer for Strange explaining how he's messed up so that's what he's starting with. Plus, he might get to talk about how amazing his wife is!