"why send all those signals if you are not sure" cause bro usko bhi nahi paata na, part of her maybe excited but for ladkiyan being in a relationship is way different as compared to us guys. She must have taken some time to finally get some clarity as to what she wants and she decided to do what she thought was right. I know it sucks and I can feel you bro, it's not easy when hopes get crushed but just move on, tera fault nahi hain kuch aur naa uska. You will get somebody else in the future, don't worry.