I'd just keep with the avoid-talking-to-him stance. It doesn't sound like he's sensitive enough to "learn" anything from your anger or desire for him not to talk to others about you and I don't know that it would make you feel any better? Besides, he'd probably only talk about your response and then give the other girl a hard time or "warn" her about you, etc. (blame her instead of himself).

I have to say though, I'd be tempted to start making stuff up about myself to see what went where :-)