Why would a girl with a boyfriend keep looking at me?

Hahfjshs
She looks at me everytime im near and also gets nervous once she looked down and smiled but the strangest thing to me is she stares for like 5 seconds or more until she looks away one of her classmates is my friend so I don't know i just need some advice and i wanna know what you think
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+1 y
Ok so my friend thats her friend asked her why she looks at me and she said that she dosent like me and that she's sorry that she has eyes (in a joking way what ever the fuck that means 😂)
And then later she keps saying that she isn't looking at me

Yes i know she was 100% looking at me so yeah thats that
Why would a girl with a boyfriend keep looking at me?
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