Why wont she talk to me any more? :(?

[Ungratefulboundary033]

Heyyy all.

Well about a year ago I went on a school trip and i met a this girl from another school who was also staying at the same place as us. We exchanged numbers and we never stopped texting each other. We were really close and we would talk to each other about everything. We didn't have any thing going relationship wise but we were really close friends. The texting started to die down a bit as we hit our GCSE's in May/June. I sent her a message on Facebook a few days ago but she hasn't replied, It says 'seen' so I know she has seen it. She hasn't even replied to any of my texts or DM's on Twitter. But she continues to make status updates etc. Im worried if I done something wrong, and im not the best looking of guys so I wonder if that had anything to do with it. I feel really down atm and i don't know what to do, any ideas?

We are both 16

Thanks