Look, he doesn't want to think about the circumstances of his death, or what little he can really remember of them right now. They're fuzzy and the only thing he knows is that he had seen a much sadder version of Alice back there. A version he never wants to see again but is also glad to have gotten to meet if only to know that there is a world out there that they worked. Which meant maybe they could here.

One step at a time.

"I've been...Alice the place I was...it was insane. It was London but not our London...it was destroyed. Something about literal hell on earth. Alice," He moved his hands to her shoulders. "It was where Celia was from. She knew it was dangerous that's why she stopped you."

It's more than he was meaning to tell her but also, also he can't help but still be furious. He had trusted her and let her in, and then everything happened and all he could think about was how Alice was left there with her.