Because he has a solid backstory unlike almost all trash MLs. I began to realize he had some kind of trauma before it was directly stated outright btw.
The reason as to why he distanced himself from Blanche was also hinted at even more in the second last chapter: both their bodies were weak and it appears that he was concerned that something similar would be forced on Blanche if he showed affection to her. Maybe his mother did love him in her own way but because she was a 'mere queen' and her son was sickly she was pressured to obtain an heir to the throne (no, I'm not using this to explain the ML's mother's actions in any way. I'm using it to explain Seiverian's actions towards his daughter. Specifically why he appears to feel that what happened to him is normal and feel that showing his daughter affection couldn't change the outcome but rather would only hurt her more in the long run).
More like hated him. I mean it was def hinted that he had some kind of problem/ trauma , but to defend or just to stan fl, so many ppl bashed him like oh god. But ppl like me who had read the novel or knows of his situation were waiting for this to happen lol. And not sure about now. But still some ppl are like 'Atleast he's trying now ' as it was all his fault. like wtf, he literally has trauma from childhood, he got raped, what do you even expect , that he opens about it to fl, we know she is not the og fl but got reincarnated, not the ml. For ml, she's still the woman who tried many ways so he'll sleep w her or can get attention from him.
I read ahead in the novel so I knew what happened to him! You have no idea how satisfying it was to sit back and wait to see how all the hate against the ml would take a complete 180! ╮( ̄▽ ̄)╭