Yeah, that threw me too. After he withdrew from the Hand Nuzzle™ scene, she kind of withdrew, closed the walls around her. Before the Hand Nuzzle™ scene they were standing so close to each other in every scene that they could practically feel each other's breaths, like there was No Space™ between them but after the Hand Nuzzle™ (ok this ™ thing is getting out of hand) they drifted and suddenly there was space between them, they often stood with arms crossed, a sort of guarded pose. Then came The Beach™ scene and he opened to her, maybe hearing something in her voice the way she talked about how Octavia would see how special he is, and he wanted to say something but she interrupted him because she 1) wasn't ready to hear it now, or 2) didn't want to think about losing him, or both.

I kept thinking, they will have to address what he was going say to her at some point, but still nothing. They got separated, got drugged and kidnapped, held at gun point - it's been high level angst ever since - and now there's even more things to address between them.