Hey I am 19 and I am interested in a girl. I am pretty sure she likes me and I like her but suddenly she acts cold and aloof. Last time I saw her she gave me a tough time like making dumb comments and messing with me . After a while one of my friends left us and then she told me something like "I think your friend already left." In other words "Please leave me alone"?! What should I do? Why do girls act that way like first everything is cool and then she is cold and aloof. Shittest? Rejection? Please give me some advice.