how to deal with an unrequited love?

back in middle school, a girl transferred into the class next door. i never welcomed her properly, but the first time i saw her smile was when i immediately knew i fell in love.

and i'm a former straight girl. moments after, this straight girl(?) found out they weren't as straight as they thought they were.

we became friends through mutual connections, and sure enough, we've only become closer friends through the years. i already came out to her and our mutual friends as pansexual, but what she still hasn't figured out is the fact that i still have feelings for her. well, hopefully she hasn't.

i'm sure she's as straight as a wooden plank, so i wanted to know how people dealt with unrequited loves who they never had a chance with.