I think I've broken 7 or 8 of the rules on Sandi's list, but I'm getting there, better late than never. I'd add one:

Try to be gone or going when he/she comes 'round. It hurts less, gives space and kills the temptation to get into sticky conversations.

Me: 46
H:42
Together for 18 yrs, married 14.
3 children: 2 girls 13 and 10, one boy 7.
Husband had affair, ended it and then decided on separation.
Separated 08/2010