I am not sure where I read about expressing feelings but here is an example that I sent to my W:
Quote
W- I am writing this letter to share my feelings with you. I feel embarrassed about the way I expressed my anger yesterday. I feel ashamed that I let my anger escalate to a point that exposed our kids to our situation before we intended. I understand your desire to get the process started. I am afraid you were skipping several key steps in the process that are critical to maintaining a friendly relationship. I understand that you believe hiring a lawyer is the proper action. I want this process to be as painless as possible. Each of us retaining a lawyer will be the most painful. If we need a mediator, I prefer that we both go together to find one. - H
General template:
I am writing this letter to share my feelings with you I feel embarrassed... I feel angry... I feel ashamed... I am afraid....
You can find "feeling wheels". I use the word "frustrated" most of the time for the different levels of anger.
I have used it in conjunction with the boundaries template very effectively.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712