Girls, Why she always staring and/or smiling to herself sometimes?

Anonymous
A girl in the gym always staring at me. She walks past when I’m on the exercise bike , she stares when passing. If she walks in and sees me she stares.

If I train in the weights room she stops and watches me , then if I walk away she stares in the mirror.

she has a boyfriend , so I don’t get why she keep staring and trying to get me to look at her. for example , she came in with her boyfriend and she saw how much more bigger than her boyfriend I am then she started smiling to herself.

then she walked in front of me to put some weights back and she started smiling to herself and her boyfriend caught her and she seemed annoyed with her.

I didn’t see her for weeks since then , but then I saw her on her own again. And she’s back to staring again.
Girls, Why she always staring and/or smiling to herself sometimes?
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