Thank you both, I’m unable to sleep so will look through the link now.
I’ve come along way since the split (8 whole years!) and whilst I have much clearer boundaries and no longer rise to his bullshit it’s the low level manipulative ways he gets to ds.
He tantrums, has huffs, hangs up, storms off. He commands huge respect(cos he is his dad!!), winds him up, guilt trips him (I do everything for you, I ‘bend over backwards for you’ is a regular comment. It’s absolute classic narcissist behaviour, towards a 9 year old 
Contact is fairly limited now tbh, especially given lockdown which helps but this behaviour manifests during phone calls almost daily. He is absolutely incapable of behaving like a normal, caring father. This is balanced by periods of love bombing, where maybe ex does feel some form of guilt?? “Oh ds you know I love you more than anything, let’s go to Florida, let’s buy x,y or z, lets make all theses amazing plans that I’m absolutely incapable of doing at the moment”.
Ds said to me earlier “I wish I didn’t even have a Dad”.
I’m more honest than I was, I tell ds that his father is difficult to talk to, that he can’t see things from any point of view other than his own. I don’t even know if this is the right thing to do.
I’m always fighting ds corner, always trying to compensate for ex, trying to big ds up and be normal and consistent and calm.
It’s heartbreaking, ds is an amazing kid. He’s made to feel like a piece of shit at times. I’m off to read and I’m sorry this turned into an essay at 3am. I think I needed it off my chest.
Thank you again 