Um wayta? She was the one who had to make the first move. And he is doing nowhere near enough. Plus he's still acting as if he's the only one who's been wronged.
If he realized that his own people were bullying her because he has memories of his past life he could have immediately approached them or her instead of waiting for her to approach them or him about it. Especially since he now knows for certain (which we knew all along) that this way of 'protecting' her was just an excuse to cover up his inadequacies. Also especially since *he's* the one who basically told her to do as he said not as he did with that sh!tty line about just ignoring what people were gossiping about. As soon as he discovered he couldn't manage to ignore her father's threats (and yes he would have been able to recognize this even in the first life) he should have realized she wouldn't be able to ignore them either and apologized for his crass line, the crass line that the FL grasped at like such a life saving straw that it was the origin for her attempts to get married to him and away from her sh!tty father.
Finally he looked like he was looking at a strange dog when she died in her last life. No emotions whatsoever. That should have been the time he regretted what he was doing instead.
I’ve seen that some people have been defending the ML after reading spoilers but I personally don’t understand. It always seems to be the case with those second chance type stories where actually the ML totally had a reason for mistreating the FL, be it because of manipulation or brainwashing or threats or whatever. I get that they have a reason but even so, it doesn’t excuse treating the FL badly. Especially because the FL doesn’t know their intentions and their reasons. In this particular case, so people have been saying that the ML gave the child to the mistress to take care of because he knew the FL was unstable and didn’t want to put more pressure on her but that’s such a stupid decision. I mean, if he really loved her and cared about her mental health as some people have been claiming, shouldn’t he have considered the emotional impact it would have on the FL to be told in front of all the servants and his mistress that she’s not fit to care for her son and that his mistress should take care of him instead. That is an absurd thing to do if he doesn’t communicate anything to her. I also really hate the fact that those stories always seem to inadvertently put the onus on the FL to change and not be so weak or naive to deserve to live a happy life.