Yes I can relate and I am sure many others can relate as well. While I have always had the urge to cut all ties, I have not done it because it would hurt them and other members of the family. And, the other thing that helped me was the following: I stopped fighting the past when it comes to my family and I did it long time ago. I was and have been dealing with the past on my own and I had stopped caring a long time ago if they ever recognized their mistakes or accepted responsibility for hurting me or i did not respond when they hurt me (intentionally or not). I found it a waste of time to ask for validation of my feelings or for them to accept their role and responsibility. It is up to them to figure it out. I also had realized that they have their struggles as well and I had to accept that.
Again, we all choose our battles in life. I have had to deal with other battles and responding to people (family member or not) who hurt me, intentionally or not, is no longer a battle that I choose to fight.
So, I am sorry I don’t have any support group recommendations but merely my own personal story to share.
I hope your pain decreases, soon. Good luck