Friend love can be just as strong as romantic love.
You may not feel the same way as she does right now. But perhaps your feelings will change, you will be able to manifest your emotions in ways different from romance, and transfer your love from romantic to platonic.
A good friend is a good friend. Romance or not does not diminish that at all, I assure you.
Friend, I think it would be best for you if you perhaps find a way to view your care for this person outside of the very restrictive "romantic or not" box that society builds for us. There are
six different attraction types. Romantic attraction is just one of them! There's emotional, aesthetic, sensual, sexual, romantic, and maybe even others. Just because you may not be able to engage sexually or sensually (touch-wise) with this person may not mean there's no more solace to be had with them :)
Side note, sometimes romantic attraction is difficult to control and we can't help but keep falling for the same person if we are in their proximity. That is understandable, and it's good to admit this and work with this in mind.
By the way, have you considered that you might potentially be experiencing something called
limerence? Essentially, a crush that will not fade at all and persists to a debilitating degree, much more than expected. There is much scientific research on this and even
a whole online community [subreddit] dedicated to dealing with these emotions. You're not alone, friend, many people have experienced what you have. There is much documented experience with what you feel, and you're not crazy or insane for experiencing this. It's
normal to fall in love with people. (Especially ones we are emotionally close to.) I promise you that you are
not a bad person merely for feeling this. Mistakes and lapses of morality are capable of being repaired, because we are who we currently are, not just some arbitrary average of something we have done.
Society always tells you that you must find your 'other half', but the truth is, we
are complete people by ourselves, and the best relationships are two people working together, as opposed to a dependence that ends up harming us. You yourself deserve to feel whole, and I firmly believe that is possible without a romantic partner. Oftentimes the most important connections in our lives are nonromantic, easily platonic, easily friendwise. This ought to be noted, I feel.
You don't have to limit yourself to this person. Romance can transcend particular people and pour into other aspects as well; art, literature, work, any work of humanity. All the emotions you feel towards this person can exist in non-human objects as well. That passion can find home in hobbies, words, art, experiences; friends, mentors; sights, sounds, anything.
Good luck, friend. Many have felt what you have felt, and you are not alone in this. It is not impossible for you to transcend beyond this person and find a new way of living. It will certainly feel difficult. But it always seems impossible until it's done. :)