Again, I really just want to thank Aithne for bringing this up and want to thank everyone who posted. This subject isn't a comfortable one for any of us.

William is absolutely right. It's awkward and uncomfortable to say to someone let's never talk again, and this issue is doubled when it is someone you have previously had no issues with and considered a good friend. Matters become more delicate then because on the one hand you don't want to lose the friendship but on the other hand you don't want to have to sit there and suffer through cybering or sexual advances just to keep up that friendship. In my opinion, this time honesty really is the best policy. You need to be direct with the person, especially since they are your friend they should understand. Say something like "I know I've let the cybering thing go on before but I'm really not comfortable with it." Don't make up an excuse as to why you won't if there isn't one. Just be upfront and honest. I'm pretty sure that people are still allowed to just feel uncomfortable with some things. If they're really your friend they shouldn't get upset or abandon you. If they do, seems to me like they were only there for the cybering in the first place and you're better off on your own.