Have you read the sticky on the newcomer forum re the 37 steps? When my husband left me the first time I thought I would absolutely die. I didn't know about this site back then but I wish I had because I did the things described in the 37 steps - quit crying, begging, etc., and it was only when I did that and I started getting my own life that he came back to me. You have to detach. It's very hard work though. But for me, it brought him back.
Now here we are 12 years later, and marriage is a mess again. Ugh.
Me: 56 H: 60 M: 32 yrs Not separated, I am seriously thinking of leaving Sons: 3, all grown