my friend who is a girl ,suddenly started ignoring me?

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there is a very good friend of mine in my college,she lives near my house,after college hours we come to our places together,we talk too much,we chatted on fb many times, but suddenly she started ignoring me,we haven't met from many days,and when ever i start fb she suddenly put herself offline or if i message her she doesn't rply... i dont know why she is doing this ,cause we were just normal as always but she started doing this suddenly