Perhaps it wasn't really the manly thing, letting Fi deal with getting her out. Under normal circumstances, he'd just give her a smack and be done with it. But isn't shock bad for unborn kids? He doesn't know and he's still struggling with mixed emotions about the baby - on one hand, he wishes it had never happened. But on the other...it has. And it's going to be born now, no matter what so shouldn't he start getting used to the idea?
None of this is easy. He's glad of the half-minute or so that Fi is out of the room because it gives him just a little space to breathe and think about what he's going to say, if he has to say anything. He really had no idea she'd show up here.
When Fi comes back, she'll find him sitting on the bed with his back against the wall, smoking a cigarette and staring at nothing in particular.