Why My Female Friend Takes A Bite Of My Food?

I am friends with a female and I don’t understand her so much not well. Today we went to a restaurant and bought food but she has audacity to ask for a bite for my food. I’m wondering why would she do that if she’s my female friend is very confusing and I don’t understand because she’s very very hard to read and understand through her behavior pattern towards me.
Why My Female Friend Takes A Bite Of My Food?
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