From experience, 3rdman's plan should do the trick. Granted, I didn't think it was a plan at the time, it is just how it went, and like most highschool relationships it failed miserably in the end, but still... I hung with her all the time, gave her plenty of openings, but she never took them. Then I start going out with this other girl, and she gets jealous. I eventualy break up with the other girl, and start spending more time with her again. After a few months (without me making any openings for her, it just wasn't in me at the time), she finaly made the first direct move.