hmm...get ur brain tickin over this
this is something i've observed to be true over a 2 case study. i know that you cant really conclude anything from 2 cases but hey, just hear me out.
lets say there is a guy and a gil. lets give them names, say Jack and Sally. now Jack and Sally meet quite often over a common factor that brings them together, eg, sitting next to each other in class, or are colleagues, or meet at church meetings. they are both young, bright, charming, incredibly interesting people. at the same time, they get along and play emotional footsie by playfully flirting with each other. both are average lookers, btw.
Jack is very charming and can just about charm the socks off (and quite possibly other items of clothing) any ice queen. he's funny and has lots of opinions on lots of issues and has tremendous potential. he is very confident, with a devil-may-care/SIEZE THE DAY!! take on life. a little on the wild side, he has quite a reputation, but overall, he's alright.
Sally is the average girl. sweet, genuine, rather naive, but is very bright, funny ... you get the picture. they're pretty compatible.
but ONE DAY, somehow or another, Jack finds out that Sally has feelings for him.
oops
he doesnt see her that way. he either already is with someone or is interested in someone else.
THEN WHAT? they put it behind them, try to forget about it by burying it under othr things..get on top of other things..or other people 
i know, i know, corny as hell, but i cant help it.
basically, they forget it ever happened and move on with life.
QUESTION: what is it with guys? i'm sure the poor girl was quite embarassed....if you're wondering, YES, i am kinda sick of guys right now.
BUT THEN WHAT? Jack and Sally let their lives take them wherever its supposed to. ages and ages hence pass...then they meet again. Jack and Sally both make something of themselves. then, somehow or another, Jack falls for Sally. and he falls HARD..and it aint just the fall thats hard. (SORRY! just couldnt help it! 
)
SO?? sally wont have any of this.. you know girls.
QUESTION: what next?