I really think that Jon’s story arc has been bungled as badly as Dany’s. He was originally presented as a tortured soul with a good heart and leadership skills. We are lead to believe that he has a destiny that was integral to the story. But there has been little development of his character since his resurrection. He mostly comes across as a well meaning doofus.
it also appears that his endgame is meant to be a tragic hero who is forced to murder the love of his life to save the world (or something like that). In order to make that work, the audience has to believe that he and Dany are soulmates in a passionate love affair (much like his parents).
They have done little to establish that feeling. I was certain they would have romantic scenes with them in S8, especially given the way their sex scene was panned. But all of their scenes have been awkward and forced, even before he learned of his heritage.
It is hard to even understand why they supposedly love each other. I don’t know if it is his limitations as an actor, bad writing, or poor chemistry, but I’m just not feeling any grand passion. I think that is going to blunt the impact they are going far in the ending.
I would never have liked the suspected ending, but it might have been more believable and maybe even moving if their individual arcs (her descent into chaos because of the terrible things that happened to her and his horrible decision to end it) and their relationship had been better developed.