Because you refuse to do what you need to do, which is to let go of his chaos. You insist on continuing to scrutinize every single thing he says and does for the "real" meaning; you are the one making yourself miserable at this point, not him. You know how I keep saying that you can't fix him? The reverse is true as well.
And, you are doing exactly what you claim you don't want to do, which is to push him away. No one can live with that kind of pressure on them, let alone someone who is going through their own emotional crisis. I don't know if it's a midlife crisis, or some other form of depression—maybe some form of PTSD?—but he is barely holding himself together, and you insist on loading him down with your baggage as well.
Me: 44, Wife: 39 M: 17 years T: 20 years Bomb on 08/25/09 1/13/10: MC started 1/28/10, 2/8/10: More bombs 8/28/10: Wife moved out No talk of D, no movement