I hope you find you enjoy living alone. I am glad that you agreed with your brother that it was okay for him to leave. That makes it easier to make the transition.
I have found it both exhilirating and challenging to live alone these past 6 months. It's been a real chance for me to grow and find out what I like and don't like. I do know I wouldn't give it up for the world.
Best wishes for both you and your brother.