Feelings I had for my classmate were obviously one-sided (pretty sure of it), so I made a reasonable decision to never confess to not make things awkward. In a few years since we graduated I finally moved on, although I never loved anyone this much since.
Yet all this time I had a desire to tell her about them. I would definitely want to know if someone loved me this much ever. Would she? I don’t know. I don’t even know if she is in a relationship right now or not.
I would really want to cite some scientific study that “Over 80% of girls have their self-confidence lifted after being told they were secretly admired (p<0.05)”, but can’t find one.
“I used to have a big crush on you” totally legit, playful, good way to see if she was ever into you.
“I used to love you” that’s weird. If you’re still friends don’t you still love her at least platonicly? The explanations you’ve been giving in this thread can only make the situation more strange and more awkward. Love means a lot of things to a lot of people so it’s a weird word to use in the past tense about a friend you used to also be attracted to.