Halsin stays that way, I'm sure, VA, authors said bye. He is the only poly character, Larian certainly won't change him because of the people here so that he becomes like the others, everything he says about relationships is clear, it would be such a stupid thing to write so that the people here get "their husband".
He doesn't have to "try it out", he sees it in other people every day.
The problem here is that people don't care about poly and a real relationship is only possible for them in mono...