Hi
hoppyhamster2. Welcome to Psych Central. I am happy that you have a wonderful son out of a tumultuous relationship from what you describe. Congratulations for staying in your son's life even in the face of painful circumstances. That shows you are a stand up guy.
You sound like you are still grieving the loss of your marriage. The rehashing is something typical of grief and the feeling of guilt. Some people postpone grieving until they are able to cope with it. Seeing a therapist might be an option to consider, especially if this loss is disruptive of your joy and contentment.
You could search in Google for Psych Central coping with divorce or breakups and see what articles are available.
Glad you are part of the Psych Central community. @
CANDC