A day or two ago, I had a nice chat with a good friend of mine who has become active in the church recently (over the course of the last two or three years) and he said to me, "Ever since I started dating Mormon girls, things have just been way harder. Sometimes I think they are interested in me, so I ask them out and then make up excuses or dog me out or whatever."
So on to the advice for the ladies: We're grown up. We can take it if you aren't interested. Just let us know. Once we've made it obvious that we are interested, just let us know whether you are or not, so that we can both get on with our lives if the interest isn't mutual. Let's not waste 4 months on "Does she like me?" Don't suggest that maybe you'll change your mind, or maybe you were just busy that one time. Be clear. And by obvious and clear, we mean OB-VI-OUS and C-L-E-A-R. Like obvious enough that a guy could actually realize. Not in some obscure, "I didn't laugh at his jokes as loud as before" kind of way.
And don't give psycho guys ideas by finally giving into some guy who's been hounding you for years. The persistance theory has proven effective too many times because girls just think that no one else is interested. And if you don't know about the persistance theory, I'll spell it out tomorrow.