Flirting

Girls, Why does a girl give me signs of interest, but does not seem to reciprocate when I approach her?

In all honesty, I didn't know who she was until she engaged me in really intense eye contact (and smiled) which I had never experienced from her. I didn't think anything of it-- after all she could've just been greeting me in a friendly manner (though I've never been greeted like that before)-- but then she did it every time she saw me. She was the one who engaged eye contact, and she would always smile first. I also looked across a room of 140 people and caught her eye again. I kept thinking: "dude you're finding patterns where there aren't any, she's probably just being nice", but the vibe I got from her eye contact was more intimate which is weird for someone I never talked to. In addition to this, she complimented me when I wore a suit for an event, again with the intense eye contact and smiling. This kinda caught me aback and tbh, I got kinda nervous and didn't say anything back. In this instance it was when I realized "hey maybe she's trying to tell you something" because a girl I don't know doesn't really do that. My girl-friend did do that too, but she said it in a platonic manner and obviously I know her from before so it makes sense. Where the issue arises is that I acknowledged in my mind that maybe she's interested, but I found some time to walk and talk with her today and she seemed very professional in tone, and even when I brought up how I didn't say thank you when she complimented me because she caught me aback she said "oh no worries I was just saying you looked good." This just threw me into confusion, because I don't understand how all the signs she was giving me were to approach her not to be nice, so was this a case of her being caught in the theme of the conversation (I asked her something about our club where she's president so it would make sense)? Or do I take this as a sign that she was in fact not interested? At this point I would just like tips on avoiding confusing kindness with interests. \

Girls, Why does a girl give me signs of interest, but does not seem to reciprocate when I approach her?
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