Why this girl is angryon me?

Me and this girl used to have eye contact for about 4 year but we haven't spoken a word but one day I suddenly confessed my feelings to her she said no but was smiling to herself when I left after that she started coming close to me and started smiling to herself knowing that when I am coming close to her in a bus stop while entering bus but I ignored her later we both look at each other when we are not looking and we ignore each other knowingly but now she always looks angry when I am around her and we both are acting like strangers I have still have feelings for her but I don't know why she is angry on me does she hate me (these sign are all what I observed and felt)

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4 mo
I also caught her lost in thought because of me at first when I ignored and next when I try to talk after seeing she is angry but she said ok ok with angry face and left but later came near to me and lost in her thought
Why this girl is angryon me?
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