I thought she liked me and now that I know the truth I feel sick

I feel your pain. Me and a friend of mine both asked our crushes to prom, and a few weeks later they both started dating each other, but we had made the plans already. So there was me and our friend and that awkward couple, and it was pretty bad. To make things worse, he stood me up the week before the prom, and didn't understand why I couldn't get another date (short notice) or why I was angry with him.

So, do what I did. Go stag. Plenty of girls go alone or in groups. Find some girls that look fun and hang out with them. Or go with a group of your friends and make fun of other people's dancing. Take advantage of the buffet. Just do something. Don't let other people's feelings dictate how YOU are going to spend YOUR night. Just go and have fun the way that you want to. And seriously, there will be other girls, particularly once you get out of high school and it stops being a "who's dating who, who's going to prom with you" hormone-y gossipfest.

Okay well the girl you were going to ask don't worry about her just ask another girl. Or ask one of your friends that doesn't go to your school. Or you could just go with friends.

You still have time to find a date. Not every girl in the area is taken.

Honestly not to sound mean or anything but that sucks. But you can't force someone to like you also you can't force someone not to like someone else. I'm not gonna say something like something like that happened to me because it wouldn't make a world of difference to you. What you need to do is look yourself in the mirror and just live. Live like you did before you met the girl. You liked other girls before right? You had other girlfriends before right? I think right now you're just blinded by the situation of how could my best friend do that to me or how could she do that to me. But the thing is I know it's hard to hear the world does not care bout you so you need to care about yourself that much more. You need to find the one that'll care for you that much more. I know this comment sounds kinda mean but it's the truth.