Re self-restraint, yes NM did a grt job in the shower scene of conveying a yearning to get close to her not much in a sexual sense but in a sense of wanting to experience intimacy with her, to feel ‘secure’ in that intimacy. And at the same time, the rueful recognition that she is nowhere near ready for it & holding himself back.
Even in the initially part of the scene where he dejectedly goes to close the tap accepting that she wont step in & then his ‘its actually happening’ look! These 2 are really nuanced actors, hope the writers can keep doing them justice.