Well then it sounds to me like he truly is in need of a bit of help. Perhaps the guy with the attitude problem that needs to go find a new place to stay is your alcoholic boyfriend. Toss _him_ out and have your brother stay with you for awhile
Or maybe _you_ can find a new flat of your own and share it with your brother.
Me thinks that the way you describe the situation, your alcoholic boyfriend is causing you and your brother great harm. What do you think?
Mike