Is a girl saying “I was with this guy yesterday at the library a sign she’s not interested?

We were together today and some topic came up in which she mentioned that she was with this guy yesterday at the library to use the software for some coursework- bare in mind they stay together even after class. All signs she’s into him however, she tends to tell me more personal things, seems to trust me more, I need advice, might hurt but it is what it is.
Is a girl saying “I was with this guy yesterday at the library a sign she’s not interested?
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