Hello Kevanjdm: I'm sorry you have not received any replies to this post. Long posts here on PC do seem to attract fewer readers. I did read what you wrote.
I'm glad to read that you recognize you need help & are seeking it. This is wise. However, your "significant other" as I'll label him, it seems to me is equally in need of help, & equally at fault for the difficulties the two of you encountered in your relationship. He, however, does not seem to share your willingness to seek help. This is, from my perspective, a red flag. Some of the behaviors you describe are really out of line, to my way of thinking.
This is just my personal thought, having read your post. But I would say that unless & until this person gets some help of his own, I would say it would be best to walk away. So often individuals in abusive relationships keep going back believing that the other person will change. But they don't. Things just keep getting worse until something really serious happens. Better to nip things in the bud, as the saying go.
I wish you call the best as you continue to struggle with this most difficult situation.