How long..... I guess really almost four years, depending on when we say it started. There was never a "bomb", no OP, so there isn't really a line in the sand to count from. Probably too long, but that was my own problem, really.
How did I know? I can't answer that. It wasn't a sudden thing, more of a wave. One day I realized that even if she wanted to work on the M, I wasn't sure that I wanted to. I realized that my life was not better with her. Not things that one likes to think about. But it comes from inside.