He has a history of being rather controlling, not in a hugely outward way that other people particularly noticed but emotionally, although did once prior to having children put a camera up (for a day apparently)in our house without me knowing to see what I was doing. Recently he went through all my belongings in order to find letters he'd written me when we first separated which show him in a rather unfavourable light and took those. He's stood at my window and listened to my phone conversations as well as turned up unannounced to see what I'm doing, there is more but it's written in previous posts and would take a while to get through!
....
I feel like I can't win!
Correct, you can't win. You are damned if you do and damned if you don't. This is how all victims of emotional and psychological abuse feel because emotional and psychological abuse is all about grinding you down, making you second guess your decisions and performance, and generally causing you to feel that you have no option but to play nice and try to guess at all times what course of action will cause you the least grief from the abuser.
Hence I suspect this decision:
we're hoping to go down the "collaborative law" route to make things quicker and easier and less fighting over things as we get on fairly well.
There is no way in hell I would agree to do collaborative divorce with this abusive horror. He wants the collaborative law approach because he hopes he will be able to get away with far less financial obligation to you and I think you are afraid to confront him so the concept of 'collaboration' makes you feel more comfortable.
His notions about you 'deserving' less than 50-50 should be an indication of the way the wind is blowing. It's more of the same emotional and psychological battering that is in store for you, not collaboration.
Make sure your solicitor is a very good one. When you have your appointment next week, ask how comfortable s/he is with respondents who are abusive and likely to be stubborn, un-cooperative, nasty, and possibly inclined to thumb his nose at the law. How much experience does your sol have in traditional adversarial proceedings?
Be prepared to drop the pretence of 'collaboration' - your STBX already has with his remarks on what you 'deserve' - and be ready to get adversarial.
Get a counselor for yourself to support you through the divorce. You will need one.
It is not possible to divorce an abusive man amicably or even civilly. Prepare to duke it out.