Is it normal for a girl to act perfectly normal after saying she does not like you?

so my shy best freind of 2 years told me she does not like me after i confessed and acts perfectly normal so i respected that and waited another year and she said the same thing again but acts perfectly normal and has flirted with me both times increasingly this time saying things like you always know just what to say your the kindest person i know your super intelligent i wish i could have the same last name as you and constantly brushing against me. i can't say i know everything or everyone but i feel like she likes me then again i dont wanna push my luck with her since she is always so understanding. background: for the past 3 years she has not had any other freinds besides me and she just told me she never wanted to bother me cause i always looked so busy before we met and she hoped i would come try to talk with her

Is it normal for a girl to act perfectly normal after saying she does not like you?
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