Okay, look at me. Sam. Sam! [Jack puts his hands on Sam's shoulders] Look at me. I understand that. And believe me, I want to stop him. I don't really want to see the end of the world for like... a third time.
You said he told you he killed everyone, but we're all alive, and we're fine. He was lying. Okay? If you don't want to go back to him, and you don't want to do the things you did, again, then don't. He clearly needs your permission for these things, right?