my love, you've seen him half a dozen times over the past 5 weeks. he's a boyfriend at best, not a "partner".
you've been single yourself for only 6m.
he's been seriously abused, and had some counselling.
2 years on, he's not ready. it takes WAY longer than that to undo that level of abuse.
I worry about the daily contact, and your feeling it's a more serious relationship than it is. relationships that are too serious too soon are something to be worried about. with his background, he could be codependant and latching on to you to make himself feel better.
bottom line, if you're struggling (which you are) then it's a worry.
I don't think he's in any place to be in a relationship. he's not ready, and you're not the person who can handle this, however much you want to be. you can't 'save' or rescue him. reading about DV isn't going to help you get even the faintest inkling of what he's dealing with, or how to help him.
ultimately, the only help he needs is from within.
my abusive ex wasn't nearly as violent/evil. I was however with him 10 years. I did therapy, individualy AND group, and the Freedom Programme alongside one another. even then the trauma/damage to be overcome was massive. it took a lot of metamorphosis and personal growth. he hasn't had time to do this.
this isn't going to work out I think, be prepared for the fact that you're a person with whom he'll gain strength in the short term, but he'll need a different person long term.