I have the same issue, its only a year, and from daily sex, it got down to every other day, then twice a week.

He wont initiate sex unless i do, he is passive when we do have sex(like me on top doing most of the work)

Yet he masturbates and says its easier for him and he ll do whatever he wants. But he says he just doesnt want sex. Everyone says women have the issues but i noticed men are the ones with the problem!