I am going to be blunt. Get away from him. I have been exactly there and did get married to him. Went through a lot to make it happen because he is from another country. I met him online. I'd describe our relationship just as you did. It was magic when it was good.

In the end, I almost killed myself to get out of the relationship. Luckily I failed, went IP, asked him to get help too but he wouldn't. I divorced him.

You deserve better than that.