You and her weren't dating but the way she treated you has gotten many people to think differently. She'd offer to hold your hand or even comment on your looks when you went out somewhere. Both of this could just be that she's being nice but it feels more than that.

You sat on the bench next to Mari, she was awfully close. Mari's hand laid on yours tenderly. It was just gonna be a quick piano lesson from her.

"Your hands are so smooth! You'll be great at this."