Haven't posted much to you b/c I am not sure what to say. I would want to slap him and say, "Wake up! You are losing me again!"
Ok but in all seriousness...when he asked you to go out with him and his sister and BIL, you said you didn't feel like going. Did you then say, "But I would like to do something with you, just the TWO of us? A date?"
I know you are sick and tired of carrying the load, and it isn't fair. But I would hate to see this marriage go down without even ONE date that was just the two of you.
Could you call him now, at work or wherever, and just say, "H, I need for us to spend time alone together, just the two of us, to see if this is going to work"....