Okay. That's not exactly a question. I'm guessing the question is "WHY does he keep bringing up my friend?"
We don't know why. We can't even make a good guess at why, because we don't know the context. If he's asking about your friend in suggestive ways or constantly talking about how good-looking she is, that's a bit different than asking how she's doing if he knows you've just seen her.
If it bothers you ... and it pretty clearly does ... ask him about it.