Dark must fucking hate Anti, but he’s also probably terrified of him. Imagine, you’ve been the only one of your kind for so long, and you know all the pain and torture that goes into creating something like you, and then this happy-go-lucky glitch bitch pops up out of nowhere, murders indiscriminately and seems to enjoy all the pain he’s causing.
And Dark’s actually scared for the first time since he was human, because if that thing is so numb as to enjoy what he’s doing and kill without caring, what has he been through, and where would he stop? He can kill regular humans all he likes, that’s not Dark’s problem, but Anti’s not afraid of anything.
And that puts Wil in danger. And Dark will not have that.