"I get that, Jo, and I'm sorry." He wishes there was something else he could do, but... Back home, maybe he could walk away from Meg like what he did with Benny. This place is small, though, and where's he going to go? Where's she going to go? And if they're going to all be here, then he'd rather try to hope that maybe one day they could get along. Or at least Jo and Ellen can get along with Dean getting along with Meg.

"I wish I knew what to tell you. You can't make up for what you missed, but you do get a chance to... start over." Redemption, rebirth. It's the schtick Dean's been trying out lately, and so far it's mostly only hurt the people he's closest to.