We can't diagnose on this forum, but it sure sounds like he needs some therapy. You might want to seek some help too to get through this.

Now, this is just my opinion, but personally, I would not want to be with this person. It sounds like an abusive relationship. He may not mean it, he may have an illness, but he has put you through a lot.

Your best bet would be to seek a therapist who can help you sort through things so that you can make a decision that will work in your best interest.

Good luck.