How do I work with or deal with a husband who is extremely pive-aggressive?

My husband won't ever tell me straight up what he thinks, what he likes or doesn't like, what makes him mad or happy or sad, what he'd like to see changed, what he doesn't want to see changed, etc., etc. It's like he doesn't have an opinion, and he does NOT have a backbone either! He only tells everyone what they want to hear, even if it's not the truth or what he honestly thinks! What can I do with this?