What does it mean when a girl, mentions other guys every time you talk to her?

Anonymous
I am 19, Indian male. She happens to be my classmate for 3yrs. We used to talk almost everyday, for last 2 years , There is one thing, rather annoying thing I observed now-a-days, that whenever we talk, she mentions that she talked with a guy on whatsapp the guy is my friend but i get so angry when i know she is talking with him I don't know why but i just hate it and personally, I like her. That's it. I never had feelings for her before but this year I don't know i think about her all the time , in any level whatsoever. All I wanted to know is what is she upto?
PS : we re just like brother and sister i guess
What does it mean when a girl, mentions other guys every time you talk to her?
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