I'm of the opinion that the 'friend zone' is a term used by pant-shittingly hateful people when they refuse to acknowledge that other humans are, well, human and not, well, fuckable NPCs or something. If you'll please excuse the wording.
People are allowed to change their mind.
People act stupidly sometimes.
People aren't always sure.
People are allowed to say 'no' or 'I'm not sure'.
People are sometimes scared and flip-flop in their dealings with you.
People are allowed to pursue those are not you.
People sometimes choose to use you right back if they realise you are trying to use them, "Nice" Person.
People are allowed to change their mind.
People act stupidly sometimes.
People aren't always sure.
People are allowed to say 'no' or 'I'm not sure'.
People are sometimes scared and flip-flop in their dealings with you.
People are allowed to pursue those are not you.
People sometimes choose to use you right back if they realise you are trying to use them, "Nice" Person.