I think all this is very common in love/friendship relations.We often fall in love with our friends coz they r the ones who really understand us and support us.Believe me,Im going through the same situation right now except that Im the girl and I have rejected the one who loves me only becoz I was scared.But right now I have developed feelings for him and Im scared again to let him know about them.If this girl u proposed to has cried for u or talks about her ex in front of u,then I think she's interested in you too coz she's out to make u jealous and see ur expressions.She's just confused coz it takes time to change tracks from a good friend to being a couple.I think u shud go for it again if she is not seeing anyone else right now coz all girls have same kind of thinking,she sees what a guy can do for her.....she will never come back to u....but probably she's waiting for u to come to her again.All the best!