Crooks is sitting in his room when Lennie comes by. They're alone, because everyone else has gone off to Suzy's clean and comedic house of ill repute.
Lennie (revealing his secret-keeping capabilities) immediately tells Crooks about the dream farm.
You'd think that Crooks would be sympathetic, because he's kind of an outcast, too. But you'd be wrong. Loneliness has made him hostile, and he starts taking out his anger on Lennie by insinuating that George may never come back.
Lennie freaks out and gets mad. Crooks sees Lennie towering over him and retracts his comment. Lennie calms down. Phew. That was close.
Somehow, Crooks decides this is the perfect moment for a speech about how every guy needs another guy to talk to.
Evidently Candy didn't go to Suzy's, either, because he comes in now to talk about the farm they're supposedly getting.