Any way to stop someone from following you?

[SwimDeep]

Someone started following me today. I asked him to stop, but I cannot tell if he did or not. Is there any way I can make sure he did?
The screen name in question is gamechanger109. The post in which I asked him to stop following me is:

pandce.proboards.com/thread/542131/fgf-hot-guy-cat

I don't have any issue with him posting on the boards, I just don't want him to follow me, and I can't tell if he complied with my request to stop.

Any help would be appreciated.