Since then there has been a gradual deterioration and I have seen that side of him more and more despite becoming more and more fragile myself (anxiety/stress/depression
and two road traffic accidents leading to ongoing injuries and lots of work stress/bullying where I felt forced to resign and had months of stressful jobseeking).
OP you have had a really hard time lately & anybody who cared about you would be making extra effort to make your life easier. Not manufacturing stress & causing needless rows.
You cannot possibly sustain your own physical & career recovery AND manage this awful man.
Even if you were at the top of your game right now - you should not have to be managing this awful man.
As far as I can make out the times that he turns nasty are all because he is jealous/insecure
He turns nasty because HE IS NASTY.
It's got fuck-all to do with jealousy or insecurity, & everything to do with anger & control.
www.amazon.co.uk/Why-Does-He-That-Controlling/dp/0425191656/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=
but he reacts badly if I say that and says it is a perceived lack of commitment on my part.
DARVO - the classic tactic of abusers everywhere -
www.banyantherapy.com/darvo/
And he's right- I pull back when he behaves like this and said we shouldn't move in after all once we started arguing, to protect both our kids from potential fallout, have refused to book non-cancellable holidays long in
advance and even got my coil put back in, partly to help my hormones but partly because I didn't want to risk getting pregnant.
So he is right that I am not committing as I am essentially protecting myself and my kids (and his) from what has become a turbulent relationship.
He's not right.
Your pulling back is NOT the reason he causes rows & behaves nastily.
He does that all on his own bat - because he is a nasty, angry person.
You are responding reasonably & intelligently to his anger by protecting yourself & your DC from it.
He has no right to berate you for that - none AT ALL.
When he is not being a cold,impatient, stubborn rock we get on amazingly well, I am ridiculously attracted to him and we have the best sex I've ever had.
Yeah.
There are millions of men out there who you would get on well with, find attractive, & have great sex with. THESE ARE NOT GOOD ENOUGH REASONS TO TOLERATE THIS MAN'S NASTINESS. They are base requirements for a pleasant relationship - that's all. Don't fool yourself he is giving you anything special.
he thinks I am silly to throw our relationship away
I don't give a fuck what he thinks.
Neither should you.
He doesn't get to tell you what you are comfortable with, & he doesn't get a veto over your choice to pull back - or ditch him completely.
YOU DO NOT NEED HIS PERMISSION TO FEEL THE WAY YOU FEEL, THINK WHAT YOU THINK, OR TO SLOW DOWN OR FINISH THE RELATIONSHIP.
but he has pushed me so hard I've had panic attacks and begun to have suicidal thoughts and he doesn't stop haranguing me or arguing with me until after I'm a sobbing heap saying that we are through
This is coercive control.
He is bullying you so hard that you end up weeping FFS.
How can you possibly consider this to be ok?
and usually he eventually admits he was a dick and apologises and we are ok until the next time,
So he bullies you until you cry & he can feel you've been given enough punishment.
Then gives you a little sop - a pretend apology - which is totally meaningless as he then just repeats his behaviour.
but my trusting him with my fragile mental state reduces with each incident.
It is calculated to.
He is gaining power over you every time he reduces you to tears, 'rewards' you by mouthing SorryNotSorry, keeps you walking on eggshells to avoid another episode of bullying.
It is the cycle of abuse, & he perpetuates it to control you & make it hard for you to leave -
www.healthline.com/health/relationships/cycle-of-abuse#the-cycle
He reacts to this with more pressure to commit and we end up arguing again.
Who does he think he is - pressuring you to give you more than you want to?
What other areas does he exert pressure on you about OP?
Start thinking about the pattern of his BEHAVIOUR & stop listening to his WORDS.
Apparently he and his ex wife used to argue a lot but it wasn't a problem-
Bullying is never a problem for the bully.
I bet his wife had a big problem with it.
Again - look at what he is doing here - instructing you what you are allowed to feel, telling you there's nothing wrong with his behaviour, just that your reaction to it is wrong, letting you know that no matter how much it hurts you, he sees nothing wrong with arguing bullying & is going to keep on doing it.
I'm just not built like that at the best of times let alone when I'm having mental health issues but he is physically incapable of biting his tongue or treating me with compassion.
Why do you want a man without compassion in your life?
In your DC's lives?
Does anyone think there is any hope?
YES!
You are one tough cookie OP. Look how much shit you've managed recently - & you are still, just, managing to keep afloat.
It's small wonder you need medication at the moment. It will also be small wonder when you eject this bully from your life & suddenly find you are feeling well enough to start reducing your meds ...
Being able to play games with your kids doesn't make him any less of a prick btw. Again - that's a base requirement of any decent adult.
And OPEN YOUR EYES - even this is is Favour Sharking (see Gavin de Becker) - he tells you you can't leave because he has fun with your kids! - can you see how performative his actions are, now you realise that he is using them to manipulate you with?
You are clearly a survivor, & an empathic, forgiving woman who has got herself & DC through some very hard times recently.
I see tremendous hope for you.
You just need to get shot of this demanding, selfish, angry & controlling man who regularly makes you cry. 