You're being a bit hard on yourself, honestly. Even if you were absolutely sure the other person didn't return your feelings, your own feelings wouldn't be "stupid". In your place, I'd carry on as if the person in question were my very good friend. If friendship is what's offered to you, make the very most you can of it. Let her do this thing for you, whatever it is, sharing trust might bring you closer. Even if it's not in the way you'd think of as ideal.