Crooks has a dream to have someone be his friend. Also Crooks wants to help Lennie and George on the farm.
Relationships Crooks has with others are often affected because his attitude may often seem a bit harsh but that's only because he doesn't know who he can and cant trust. However you can see that once Crooks knows you mean no harm he will open up and become less harsh.
Crooks definitely thinks his dream of having someone be there for him is worth pursuing. However i don't think he believes his dream of working of the farm with Lennie and George is worth pursuing.