This is so hard because you know this isn’t the first time they’ve had this conversation. They probably have it every time he visits her. He squares his shoulders before he goes in there, and hopes for the best, relatively speaking. You can see it in his face in that second gif - the way he literally crumples when he sees that he’s lost her again.
“I like to make films because I like to go into another world. I like to get lost in another world. And film to me is a magical medium that makes you dream…allows you to dream in the dark. It’s just a fantastic thing, to get lost inside the world of film.” - David Lynch