Here is something I did while H was with OW to "let go" of things.

I would write down the hurtful thing (or in your case the "nag") and put it in a jar, when I could forgive/let go (ie not care who was "right") then I would throw the paper away.

Me: 35 husband:39
Sons 16 and 11 from my first marriage
Twins 5 (boy/girl)
Daughter 3
Affair bomb 2/27/14
He moved in with ow 3/13/14
OW kicked him out 6/15/14
4/2016 he seeks help for sexual addiction