Please find out why you would put low value on yourself and have someone like this in your life. This is not a friend, it's someone who has serious problems and is VERY unhealthy for you to spend any time with at all.

When someone starts treating you badly, walk away from them, realize you are worth more than to stay in any relationship where someone treats you badly.

You may be a caring person, but there are people out there in this world that will take advantage of that. When someone starts getting controlling or says mean accusing things to you or puts you down. WALK AWAY and stop interacting with them. TOXIC people have a hard time with that, they often look for some way to rant, vent, and express anger. So the faster you can get away and stay away the better.

Now that you rejected him, please be careful. He may try to take some kind of revenge. So don't go places alone and lock your doors too.