Everything you’ve said throughout this thread sounds like you’re massively over-romanticising the nature of your relationship.
You’ve described him as horrible, hateful and contrary with an attitude that stinks, but then in the next breath you’re waxing lyrical about deep connections. Essentially, you can’t vent about how hateful, horrible and contrary someone else and repeatedly describe their attitude as stinking, while you’re telling us how hurt, upset and angry he regularly makes you, and then expect people not to roll their eyes when defend him and imply he’s your loyal soulmate and insist that you can ‘find a healthy way of being together’.
You don’t just ‘need a healthy way to be together’. There is no healthy way to be with someone like this.
I don’t mean this as an insult, but as a genuine insight that I think it’s worth considering: it’s very interesting that you say you were initially together as teenagers, because to me as an objective bystander, the relationship, the intense, angsty terms in which you’re talking about it, and the behaviour of you both within it all sound like something I’d expect from a couple of 17-year-olds.
All this talk of connections and trauma bonding and working on conflict styles is just masking the real problem, which is that this an immature and toxic relationship with a man who is regularly vile to you. Healthy relationships with kind, loyal, loving partners aren’t full of this drama. He isn’t going to change and it isn’t going to get better. All the overthinking and therapy speak in the world isn’t going to change the facts of the situation.