Have Relationship Questions? Ask a Counselor for Answers ASAP
You can not be held responsible for his libido issues or whatever else is going on in his head. He would have to communicate better with you (the marriage is something to be sustained by both partners)
Before you make any major decisions, see what he is willing to do about the situation (it had been going on for a while) Is he willing to talk to someone, go to marital therapy, etc?