What does it mean when your boyfriend won't give you keys to his place?

It could mean that: * he doesn't like you * he found some one else * he does not trust you * he values his privacy * he cannot afford to have the locks changed (if things go bad). Instead of guessing, or asking all of us (who don't have a clue as to why he would do that) - why not ask him. The first step to a relationship is communication.