for your age, 8 months is a fair amount of time to date someone..usually after the 1st 6 months the newness wears off. not that this is a bad thing.. im glad u both had a good relationship..u can build on it with future girls..its pretty normal to want to be free in your senior yr of highschool. alot of changes occur, her behavior is pretty typical..give her some space, chill and see what comes your way.. u may have a new girl by the sr.prom.