He genuinely is a selfish and horrible person. He even uses her family in the current life as a way to blackmail her to come back to him. He doesn’t take no for an answer whether it’s the past life or current life. He will not hesitate to kill people to get what he wants, even if those people are the FL’s loved ones
Oh another spoiler for why he’s trying to stop her from dying:
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He’s the reason she died. She committed suicide because of him, because he made her suffer so much. If you ever read the broken ring with ines, he’s like that red haired ex husband.
Funny thing is, he technically had the chance to change in this life since he’s self aware of the damage he’d done and all his mistakes, but he doesn’t change. He only puts on a nice act last minute. He’s still rotten at the core.

Wait someone spoil me, the duke/ black hair husband remembers the past??? Was it a misunderstanding?? him killing her family?? i find that hard to believe but he’s acting like if he’s trying to stop her from dying like he cares for her which is very peculiar