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That's because rape and assault are a power play while cheating is an act of cowardice.
One is about power, obsession, control and sadistic pleasure while the other is about lack of commitment, a desire to escape both consequences or choice and deceit.
While rape and assault are worst than cheating irl the psychology behind it is linked to a lot of kink. As a reader your omniscient point of you also confirm that they do love each other. And it's a sexual act.
On the other hand cheating is not a sexual act but an act of manipulation.
It's easier to justify violence than lie.
If you understand that then you understand why one get a pass in fiction while the other don't.
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I'm not sure I understand everything you wrote (but I've been reading Manwhas & novels for hours now, incldg these reviews) but I agree w you. I feel like cheating is worse because it's about trust and being in a committed relationship and love. It's different from the other types of aggressions. I feel it is worse emotionally than rape and abuse. I don't know why.
I'm not a fan of rape or abuse and I despise stories about lockups and inflicting wounds to keep a person from leaving, etc. Btw, so I'm not justifying hate on cheating cuz I don't like any of them.
why does everyone hate on this manhwa sooo much its supposed to be from the perspective of alpha dude (a cheating dick) who obv wont see a problem with what he's doing
also its obvious beta bro is cheating too (or at least interested) i cant wait for them to break up