My thoughts are that you keep the 180/Sandi rules going. Be cordial etc.. but show that you got your life going and that you are truly ok with letting people be free to make their own choices... and of course you will make your own choices. (as long as this comes across from a perspective of self confidence and maturity...)
Our minds will drift in and out of the emotions when it is us.... So try to step out of your self and view your situation like it was a movie and what would you tell your character to do next... (not sure if this is helpful... but I do that when I learn from this forum and then look at my situation, I picture what I would tell the character (me) to do)
H (me) 52, W 42 M 15 D14, S12 PA June and Sept 2016 Found out Sept, confronted Oct NC with OM since Oct, remorseful Dating since Nov