IMO, I think that the frequency of your sex is a result of the bad habits that have developed in our relationship. I know, I am living that out right now, and for the record twice per month would be a lotto ticket compared to what I have.

The idea that he wont do x so you now don't do y, is what kills the safety, comfort, joy, happiness, sensuality of a relationship. All relationships goes through ups and downs, but keeping these actions constant is what keeps you coming back to your lover.

I know it is hard but try to spark something between you two, and not for a day either. Give it a two weeks. Cook his favorite things to eat, speak before you go to bed, try to connect in some small way. It could lead to more but and it will be awkward at first, don't continue if it feels uncomfortable, but fight through that pride and see what happens.