Bruh that's why it's called fiction . Bro is a villain , he's supposed to do morally wrong stuff.
There's also such thing as a likable villain, which is what this story is going for. It's possible for someone to realize someone is a bad person and fall for them anyway. But the novel being all like "this poor man is so pure and I never realized it and omg I'm so in love with him now because of his kindness" gives me the ick and is also kinda boring. Going back and forth in your head and knowing liking the villain is wrong is more interesting.
Honestly, I just find it incredibly unsatisfying having them play every one in the way they're playing them. I like seeing people one-upped and tricked, but him making himself look like a martyr just kinda makes the plot of a villain embracing being a villain weaker and slightly less appealing. Heck, even if he revealed his evil at the end but the person stayed with them, it'd be more interesting. You're a villain. You're caught. Show them just how bad you are.
I know they’re villains and they’re gonna do awfully fucked up things in the story, but idk relationships based on lies make me feel weird coz of consent and whatnot