I imagine Jesse that you are going through lots and lots of stress and anxiety. I know, I am at the other end of it...well nearly, still sorting our property. It has been a year of worry and stress for me too. It's just not easy to kick them out when it's their property too, or just pack up your things and leave your home. That takes loads of energy and planning....plus just the thought of ....what am I going to do now, where will I live?
I suggest you take some of the good advice on here. Start planning what you want to do. Get as much legal advice as possible if you have property to split. I would not tell him what you were doing either, because he might become spiteful and you might find you are the one who loses our financially. I would be making sure he has no access to any of your bank accounts or if they are shared get your own and make sure anything you own is safe.
I will add that he really is a creep and very selfish and probably thinks he is God's Gift. Even if his relationship breaks up, which it looks like its not going to be a life long thing, he will always be the same, creeps never change.
The other thing I will add, is that I am really happy now, I look back at my relationship and most of the time it was just hard work!