While giving your significant other a long and comfortable hug, ask him what you could do, if anything, to make him happier. Warning: even if he CAN articulate it, he might not tell you, y'know, if he believes you don't truly listen to him. Maybe promise him you won't get mad, maybe promise him you won't immediately turn it around to how his answer makes you feel. Stephen Covey said the wisest thing I've ever heard about communication: "Seek first to understand, then to be understood." It works wonders and applies to all kinds of relationships. Good luck.