OP I was 40 when I met my partner (age 30) who was my first partner after getting divorced having been married for 18 years.
He went mental a couple of times and smashed up the house. One time it escalated to him breaking things and he shoved me backwards onto a brick wall cutting my back and locked me out of my own house (which I owned, we shared) with my children upstairs in bed. Several times he used physical intimidation as a threat towards pushing me down the stairs.
Between every incident we made up, he was totally apologetic, things went back to 'normal'.
Then he did it again.
And again.
OP I know it's hard but what you said chimed with me - I too am a ballsy gal but if you've not experienced this type of person before, it can be a real brain f*ck and you don't realise it's happening, or what's happening.
What we can all tell you on here (those of us who've been through it and come out the other side) is that it WILL happen again. And that there's a huge huge chance that it will escalate going forward.
Can I also say there's nothing 'special' about your relationship with him - let me explain that because it sounds super harsh (but is not meant to be an insult to you, quite the opposite actually). But what I mean is this. When I got with my partner after a while I realised he had problems (within 6 weeks of being together he'd already threatened to kill himself once!!) but (as an experienced mature woman) I thought hah, nah, I can change him! We've got such a special relationship and I am so special to him that he will be able to change with my influence. Total bullshit and bollocks that was! It just won't work no matter how fabulous a person you are (which I am and I'm sure you are too!!) because there is NOTHING you can do to improve it. Because the person themselves is fatally flawed in character and CANNOT change. CANNOT. No matter how well or in which way you explain it or frame it, whether you speak quietly or shout. The change just won't happen.
Since ending it 5 years ago I have had SO many lightbulb moments you would not believe - insight into just how bad things were. In the end the good times and the mind blowing fantastic sex and how MUCH we loved each other (and we truly truly did) - the relationship was abusive and not good for me or my children. The reason doesn't matter. Immaturity? Had a crap childhood? Doesn't matter. If it's hurting you and/or your children whether emotionally or physically or financially all I can tell you is
it. will. not. change.
Well it will - but only to get worse and I truly mean that.