Help he’s turned into a monster!

I left the village to come and live with my uncle in Abuja. Unfortunately, he lost his job and since I was already employed by a private nursery school, I decided to move in with my boyfriend who is a personal assistant to the proprietress.
At first, he was really nice and I slowly started getting my life back together, buying things for the house and for myself. Almost overnight, he changed. He locks me in all the time as soon as I return from work. He wouldn’t let me go out with him and always times me when I go to the market. Whenever he thinks I’ve taken too much time, he’ll beat me up. He doesn’t drink, and he’s not on drugs but his eyes are always wild and scary when he’s angry.
Why is he this way?
Blessing, by e-mail.
Dear Blessing,
I have no idea why your boyfriend is suddenly behaving in this way.
It might be that he’s mentally ill, or that he has a violent personality.
He’ll probably try to assure you that his behaviour is caused by the way you provoke him. He may tell you that if only you were loving, he wouldn’t need to be like this. You may even end up thinking that if only you could change, then he would change.
Well, you are wrong. The reason your boyfriend is like this doesn’t matter.
What’s important is that you get out of this situation right now! It may feel impossible, but you must escape. Violent men seldom change.