Job, I agree - I think if he ever were to fall he might have a total meltdown, and no way of putting himself back together.
If this doesn't sound strange, I believe he is attracted to my lack of drama. I was the only person who helped him to feel safe, and now the euphoria and drama are largely gone, he is left with a huge hole in his life and a growing sense of the extent to which he has blown it. I think he sort of 'hoped' that he could waltz back into our lives last spring (2013) and when that didn't happen, some reality leaked in, but that scared him so much he began lashing out again. This last year has been characterised by extreme anger - perhaps more than at any time. This was the bit I didn't understand.
You have always said to sit quietly and the answers will drop into our laps