before considering divorce, you should first think if there is anything you can do to save your marriage. i don't know what issues you're having with your husband, so i can't really suggest anything in particular except marriage counseling.
once you've tried everything, and it /still/ hasn't changed, then you should consider divorce.
BreAk it off now. The longer you lead him on and leave him to think everything is fine, the harder it's going to hit him and the more it will hurt him.