I'm no Paige fan, as far as I'm concerned she becomes more unlikable with each day that passes, and I certainly don't think Jack led her on but I do question the wisdom of spending the amount of time with her that he did given their previous relationship. It's hard to see what his alternative would have been though. The seal of the confessional meant he couldn't tell anyone else he believed she was in danger.
You could argue that he had no way of knowing she'd take the attention she was receiving as a 'come on', but I do think it's a bit naive on his part not to see the risk, even if he couldn't see any other options. Then again, given that he does love her, it's also very probable that he doesn't see the self centred, self obsessed, shallow, immature child that many of us see when she graces our screens.
Have I mentioned that I'm not a Paige fan?