well i was in a similar situation. she lead you on, shes probably not too interested thats the harsh reality of it. when i went through something similar one person told me something stupidly obvious but something many forget - feelings in relationships have to go both ways and match in strength and they didnt for you. ultimately, you need to stop thinking about her - i know too well thats easier said than done. truth is it just takes time, months even of you just focussing on yourself and then then you kind of get to a point where you find someone else, and then you really get over the old girl. even then tho, youll always have some feelings for that girl, but you can live your life and be happy knowing she simply wasnt right for you