Your W is not insane because she isn't interested in sex. And, you are NOWHERE near done with your M. You are swinging wildly, acting out.
Chill. Taking a break is good. Read PM. Do not put forward idle threats, and don't do anything further regarding D until you have some stable thoughts about it for a few months.
Now, regarding your 90% of the work tantrum, quit blaming her, this is your choice. Instead, if you are tired of doing that much work, STOP. Indeed, this is probably the best thing for your R -- give her some space to help, to figure out what she wants.
Have you ever tried to work on a project with someone who winds up doing all the work and considers your contributions poor? Not much of a motivator, huh?
Read PM.
And, one night of sex is NOT the problem. Saffie is right.
