Hi, I read your thread last night and wanted to post, but was too tired to think straight.
What I was going to say was, you do need space from them. Having no contact for now sounds like the right thing, but it doesn't mean forever. Circumstances can change.
Reading this morning, your father sounds like a really horrid man. He obviously has a lot of issues himself.
My dad was controlling, but nowhere near that extent, and I loved him to bits. He did completely dominate my mum though and, as a child, she always took my side in arguments. When I grew up and left home, she really changed. It was almost as though the fight had gone out of her. She was actually quite happy in herself, but wasn't my mum.
In our case, we very sadly lost my dad to cancer a few years ago. It was awful, I took it very hard, bit had counselling and got a lot straight in my head.
And, within weeks, we had my old mum back.
I think there are two things here - first, you need to make a break emotionally from your father. As my counsellor repeated endlessly, our parents often have their own issues, you have to be independent of them, and realise that you cannot make them happy etc.
Secondly, I would bet that your mum has not gone forever, she is simply trying to please your father, who is clearly very controlling.
Tbh, if I were in your position, I would carry on with the counselling, break all emotional ties with your father, get your head strong and have a good and happy life. Keep the door open for your mum - no harm in sending birthday cards etc, and if she does find the strength to come back, let her in.
Good luck. X