I’m a bit scared because we did break up briefly a long time ago (before kids) and he would not accept it and used to stand outside my parents house and ring up and scream down the phone at me or my mum.
if we ever seriously argue he just tells me there’s no point in living.
I suppose I’m just starting to realise that me and the dc just tiptoe around him.
He has a very good way of making you feel guilty for things that he has done if that makes sense?
He has a short fuse and is constantly shouting at the kids.
He can be quite intense. I’m also scared he will do something stupid.
This is abuse. He is abusive. These aren't features of a bad relationship, these are features of somebody abusing you.
The reason you are afraid is not because you're "overreacting" or "too sensitive" or "weak", you are afraid because he is abusing you and he wants you afraid. It makes you easier to control (which is what abuse is about, not the "abusive monster" or "endless violence & cruelty" you might be using to judge whether this is abusive or not).
This is how an abuser behaves, and this is how you've detailed him behaving: m.youtube.com/watch?v=d5NHBn5p9vY
He doesn't have to be a carbon copy of every single example in that video - one of those things alone would still be abusive and unacceptable.
So, firstly, don't tell him what you're thinking. You're right, he won't just calmly accept it, and he will go on the attack in the way he did before. Abuse is about having control of you, and you deciding to leave means he loses control of you - hence him ramping up anything he can think of to try and drag you back into submission.
Secondly, call Women's Aid for advice: 0808 2000 247. They will be able to help you sort out a safe plan and prepare yourself. It might take a few tries to get through, but don't give up. They exist to help people in exactly the situation you describe. Please don't feel that it's "not bad enough" for you to call them - it is.
Remember, if you ever feel afraid of him, you can and should be calling the police immediately. Don't wait for things to get out of control before you allow yourself to call them.
Thirdly, once all the practical stuff is in place, get yourself on the Freedom Programme so they can help you understand what abuse really is, how it works, how it's affected you, just how abusive he actually is, and what a healthy relationship would look like.
Even if you have no interest in any other relationship ever again, FP will help you rebuild and make sense of all of this so you and your DC can heal from it and have stronger, brighter futures. FP covers how children are affected by living in a home like this - and how they recover from it. So that knowledge will help you to help them too.
Www.freedomprogramme.co.uk
I'm sorry this is happening to you, but you will get through it and it will get better. Take all the support available. You do not have to live like this and it is not your fault.