LIFE SUCKS

Friend issues HELP

I'm not an over-dramatiser,my life isn't utter shit(although i submit to the irony of writing on this site). There are a lot of people much more worse off than me, i conceede this is true. But, my life has been very difficult at the moment, in terms of social status. When I came to my new school, people at my old school (which is 2 miles away from my old one)told my new friends that i was a "loner" and a "nerd". And that labeling has really stuck with me in a bad sense. Now (2 yrs later) I have 20 so-so friends, and 10 real friends at school alone. One of my best friends, lets call her, Connie* ditched me for the more "popular" people at my school. I sat with their group once, and 2 weeks later i go a threatening and utterly unprovoked rude message from one of her new friends *lara about how i was sitting with her group and how i should just leave and "stop texting".We used to call each other every night and we had fun together, but i'm not a pushy person and it was obvious that we were great friends mutually. Now, I'm not the most popular, i'd be about a 7 out of 10 on the popularity scale but we had such great convos and stuff that i really feel bad. Not everyone at school hates me, just i'm really academic and i'm guessing people feel intimidated by my presence. Although, I am a real entertainer socially, and am known in my peer group as a laugh .Obviously, i'm not a freak or socially inept, i go to parties and get tipsy but the loss of a friend (we have only been friends for 3 months)is pretty depressing. I was wondering, who is at fault here? and Have I done much wrong? I honestly need some help and it would be much appreciated.