Why does my husband have no drive? was great before we got married; now he just makes excuses.?

Before we got married, we had at least once a day. Immediately after our wedding, he began to make excuses. Its getting old. He's also reverted to an old habit/addiction (I have a moral objection to !) I found out he used Enzyte when we were dating. I feel like this was False Advertisement. I really love him... and have tried to be understanding. He seems to resent any effort I make. When we do have , once a week, it doesn't last long...but he says he enjoys it. He makes comments about my , , whatever, all the time...he likes them but doesn't have the energy to initiate anything. What's up with that??? THIS IS A BIG PROBLEM FOR ME! He won't discuss it, or see a counselor or doctor.