That surprises him, but it's not as though he can argue something he wasn't there for. That won't help, and while he's never had siblings he does know those relationships aren't always easy even if it's hard to picture them getting that bad. It's hard to imagine her doing something like that, but in the end she's not someone he's had chance to really get to know just yet. Maybe Bo seems as sensible as she does because she's made such serious mistakes, not because it was something that came naturally to her.

It's hard to know what to say to that, but he can't just not say anything.

"I... have no idea what that must be like."

It feels a bit empty, honestly, for the weight of what she's just told him.