Divorce is much more expensive than canceling a wedding so if the expense of canceling it is the only thing holding you back, let that go.
I'm a bit confused because you stated you ended it 3 months ago and you are making plans to separate and move out and yet are still also going forward towards a wedding and calling him your fiancé.
You give a ton of push pull messages here with what you write and I'm guessing to him as well. It doesn't make you a bad person or anything, it's just very confusing. (No judgment here, I've done it myself.)
I'd suggest perhaps looking up something called ambivalent attachment. After abuse, people often find it hard to emotionally connect with people. Some people are avoidant, some people have preoccupied attachment patterns, and other people have ambivalent attachment patterns where they tend to push and pull people away at the same time.
we have a pretty great life it's just that I want things that he tries to give me like through holding me, touching me, buying me things, and that just doesn't work for me. So I push for emotional or mental closeness and he can't handle it.
Have you ever heard of a book called the 5 love languages? The way he shows love is he way he shows it. The way you receive love may be something different.
Neither of you is right or wrong in the way that you show love and kindness to each other, and neither of you is right and wrong in the way that you can receive love. But both of you need to figure out how to be able to receive and give love with each other, or it's simply not the right relationship.
He also is showing some serious signs of struggle to emotionally regulate himself. Marriage counseling and individual counseling for you both would be a great idea.
Getting a support system doesn't mean going out and finding other men. I mean other relationships that can help you lower your stress cup and get other needs met. It's not healthy to put it all in one relationship like you are trying to do. If you lower some of the stresses you have in life and get some of your emotional needs met elsewhere, it's going to be a lot easier to figure out all of this.
I agree with
@Eve Harrington that you are in agreement with your abusers and that does let them win. You nullify your needs just because one person can't meet them. You are telling yourself messages they would want you to believe.
If that's not helpful to realize, ok, then discard it and take in what is helpful.
I'd push pause on this relationship and invest heavily into therapy to work through the past trauma and work on ways to get your needs met in a healthy way.
If you move forward towards increasing commitment and intimacy, chances are that he and you will both fall apart more and more.