How to get over a lost friendship?

ok so me and my *former* bestfriend have known eachother for years. we have had so many good, and bad, times together. my family recently moved due to a tragedy and it pretty much tore us apart. she stopped talking to me as often as she did, and she doesnt tell me anything anymore. now she is best friends with people we couldnt stand. i feel like she ditched me in favor of someone she could actually see on a daily basis. we arent the kind of friends that like to have muchy discussions about this stuff, so talking wont work. i dont think she knows how badly she hurt me. im painfully shy so making new friends is like pulling teeth for me. ive become somewhat of a loner. i miss her so much, but i feel like i should move on. i recently invited her to come visit me, but she had summer school and couldnt. it feels like some of the other girls she is friends with now are trying to kick me out of the picture(some facebook comments and posts led me to this). how can i get over this? it makes me cry just thinking about all of it. she pretty much left me when i needed help the most. sorry that this is so long, i just needed to get it out. if you have any advice or personal expirences to share, it would be great. Thanks