No offense Silreath, but posting this the forum might not be the best way to ease your pain. Don't be surprised at the answers you are getting here, especially if some of them are hurtful. I tried posting this kind of thing before myself; all I got was a boatload of bad ideas and hateful comments about the girl I like, in addition to some completely off-topic antireligious bait from Lalam24. Posting this to the forum looking for advice is not going to get you much of anywhere when it comes to this kind of subject, and your heart is only going to get further crushed.
My own advice comes in three steps:
1: Don't be friends with that jerk who lied to you thinking you'd find it funny. That kind of stuff is nothing to joke about especially not the way he did it. He is not worth being friends with if he pulls baggy stunts like that.
2: Talk about this rather with someone in real life who you can trust to tell, perhaps another good friend or one of your parents. Preferably do this over text, from my experience it is much easier to do it this way.
3: Learn to accept that she doesn't like you. This can be very painful to go through, I have been there. Rejection is a very painful thing, especially if you have visualized a future with this girl. The thought that you won't be the one who she falls in love with, gets married to, has love with, and bears children to and grows old with can be one of the most painful thoughts that guys at our age can have. But you have to accept it and move on; you MUST. I spent four years of my elementary and middle school life chasing after my crush after already being rejected, and my efforts got me nowhere. So take my advice and learn to move on. This is very critical.