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 emphatically disagree with your proposition.
About a bajillion different people are credited with saying some variation of, “What other people think of me is none of my business.”
It must be exhausting to care about what everyone thinks of you. That’s a burden you are not required to carry. It’s also a burden you should not foist on someone who hasn’t asked for it.