"I was asked to be transferred out of your store 2 mos ago as you know. I am committed to my wife and making our marriage a priority. From this point on all contact from you should stop and is considered unnecessary."
Ok? Short and to the point
Your character is what you do when you think no one is watching.
Be sure to let her know that it needs to end and if she continues there will be swift legal consequences.
Then be sure to change all emails, numbers, any and all ways to contact him.
I didn't get this, so consider yourself lucky that it is happening.
We are done fighting with each other and decide to fight FOR each other.
From this point on, any further contact will be referred to my lawyer for harassment charges against you.
Brilliant, but I'd expand it slightly:
This is the last time I will contact you. Please do not attempt to contact me in the future. From this point on, any further contact from you will be referred to my lawyer for harassment charges against you.
If there has to be business contact, the letter should allow for it.