welcome to the friend zone, population you.
Your story is the stuff of most 80's teen movies. C'mon now, dude. Haven't you watched them all? No? Get a crash course in "Not another teen movie".
Also, watch this:
https://www.youtube.com/watch?v=T_lh5fR4DMA
You need to either risk telling her how you feel, which will force the issue and likely push her away if she doesn't feel this way.. Or give it more time to see which way she goes, while giving her more concrete signals - like invite her out and call it a "date". Valentine's is coming up - good time to give it a shot.
But. If you're just under her nose and she's looking for relationship on tinder - or worse yet - discusses her dates with you? You're friendzoned, checkmate.