Responses

I do feel bad about how he grew up but in the end of the day, your trauma doesn't excuse you from abusing other people
Don't forget that he abused her too, the girl is traumatized (let's also remember that the manhwa didn't show all the abuse she suffered like the novel)
I don't think these memories of Ruby liking and being all cute with him are her real feelings, is just an act she put to survive
This is from his perspective right? Because Ruby did act like she liked him so he would abuse her less
He see all this as him being good and taking care of her but in reality, he's just another abusive bastard