What happens when you delete a bbm contact?

I have bbm on the iPhone and so do they, I deleted someone last night after an argument.

Just wondering will the chat still be on their phone or will that also go as I don't want them to be able to get my pin again? I'm new to bbm so I'm not too sure x

The chat on their phone will be deleted also.
They still can add you again though (if they still remember your pin), unless you block them.