Time to Clarify

Ok, I need to clarify a bit.

1. I did confront this person. They don't believe they are acting the way they are. A number of other board members do believe this. Unfortunately, short of throwing them off the board and out of the organization, there's not a lot I can do.
2. I'm not leaving the board until my term expires in November.
3. The challenge is that I had planned to leave in November - before any of this happened I had planned to leave. I have been approached by another board, that I would like to be a part of.

So, my problem is whether or not to continue with my plan to leave the board in November, knowing that the bully isn't likely to leave, or even admit that they are a problem.