You can be there for him but not encourage his behavior in the A. He's going to have to have it die.
In terms of the other things, did you change any of those behaviors that bothered him? It seems like if he threatened D a few times and you didn't take it seriously, you should take steps to change those things now.
Also, don't be surprised about the lack of sex maybe being a reason also. Maybe he just didn't want to have sex with you. I mean if you kept nagging him about stuff it could be a real mood killer.
"I have firm beliefs in being cost effective and energy efficient in our life. Unfortunately my H doesn't share the same beliefs."
Mind reading. He could very well want to be cost effective, but not in the way that you wanted. You mentioned you were critical of him. Well who would want to stay with someone who was always critical of them?
Just playing devil's advocate here.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.