Love Arthur Morgan (possible spoilers) (Red Dead Redemption 2)

Possible spoilers in the topic!

A question for those who passed the game.
We know that rocky has developed two love stories, but one was cut due to its weak credibility.
Is the Appendix Valentino is the strong line, where the developers stopped.

Maybe I didn't get to the point where all will fall into place, but while Arthur is behaving unreasonably as puritanic, while around him the gang members live in full. What the hell!?