Asked to leave... or fired?

I definitely had a rough day at work today but I did make it through to tomorrow. I have a boss that I don't think realizes how to deal with stress and ends up taking it out on the people in his direct line of authority. I also think that because I have a will of my own that he is somewhat threatened by it and just wants to replace me with somebody who is easier to sculpt into his own image. It is pretty frustrating. I hope he gets some guidance/course correction before he creates too many more problems.