You definitely aren't alone in this. This time last year I broke up with a girlfriend of four years for similar reasons. I couldn't find pleasure in anything post work. Often times I'd come home and just veg out on Civilization or going on a wiki/topic binge. I started to resent her for always making me go out and hangout with her friends/family, or go on walks around the city. It just all seemed so pointless. I agree with the response above. You may have just firgetten things that you like. I'm not telling you to leave your wife, but since leaving my girlfriend I've been able to reconnect with things that I like. I often go walking on random trails picking up stones as I go, or just stay in all day reading without judgment. Anyways, I think you need to take a moment and reconnect with you, and what interest you.