<human>: Could you distill the essence of the text into 1-3 sentences?

Me 19M, her 20. We were introduced through a mutual friend (my really good friend/classmate) and all 3 of us hang out for hours after class. She's been with her boyfriend for almost 2 years, but I can't help but feel like I'm crushing on her, and my best friend can read me well enough to notice. I know I have next to no chance, but every once in a while, the way she looks at me, or something she does, almost feels like she is kind of feeling the same way back. I was told that she has somewhat of a flirty personality, but this is much deeper than that. What do I do reddit? I still want to be her friend, we are both pretty close.
<bot>: Crushing on a girl I know through a mutual friend, keeps showing signs that something is there for her too, dunno what to do, and I still want to stay friends.