I used to think Deok-su cared for Mi-nyeo until tug-of-war.

Gwi-nam has several insecure moments and even a brief moment of remorse but destroys it in his final fight.

Future Zamasu showed horror at Gowasu's death but moved on mere seconds after.

MCU Myestero cared for Peter before peter leanred he was a fake

Amon Goeth

Alan Yates wanted to save his girlfriend, Faye, but ultimately decides to leave her to die.

The Joker actually had one of these moments as well, he started genuinely developing feelings for Harley Quinn but hated those feelings so he sent her into a space rocket.

He briefly regained them in Emperor Joker as well, which is really the only reason he isn't PE in that comic. Oh yeah and in Going Sane when he thought Batman died, he actually tried to live a normal life with a wife before Batman returned.

Dabi from Tabbykitth's Tabbyverse used to care for his Corviknight, but that completly changed after it turned against him.

He is not approved as Pure Evil but Plutus promised to be a good ruler, and nigh-instantly subverted it by enslaving and torturing the planet

I can’t remember a few I know.

But I do know of Pride from FMA 2003 who might have cared for his son but destroys it once he killed him over a remaining piece of his skull, the only thing keeping him alive.

Or overall, I just don’t know any.