This is why I don’t think weeping is aware that his behavior is pushing away the only person he loves. He has been pushed over his entire and when he killed Sergei, he felt confident for the first time in his life but that end up not only killed numerous people but scared Margie

His obsession over Margie can be interpreted in a couple of a ways. He sees her as the only good thing that happened in his life so he feels like he needs to have her without being aware how creepy he comes off especially when he is acting how her ex husband behaved.