It is needed to understand the character. Since he is the main antagonist for now it's important that we can understand his actions and relationship to mc. Plus it can serve as foreshadowing, if the mother ever appears you won't need to be explained who she is and what's her deal anymore for example.
Also I'd rather have it now than later when it doesn't connect to the story.
For a second I thought the same too, I really dont care about this assholes lifestory. Like gtfo of my sight. But upon second thought, the reminisce is actually okay. It just explains why he did the things he did, it didn't excuse any of it. And it shows he was able to recognized the shit he pulled back then was horrible and he about the learn actions have consequences.
yea ik that, but its jus the same thing how he was driven to do that shit bc of one certain person and blah blah blah. It happens to every villain in the story here n there it wasnt new. (Speaking as a varabus hater im sorry i wouldve understand if it was someone else im so fed up with a pos likw him )
That reminisce isnt needed, really.