Seems to me there's 2 reasons people do that. One is manipulation. The other is lack of self confidence. Neither is better because neither is healthy.
We humans have so many screwed up ideas of relationships. I mean, little boy hits little girl every day and when she tells her parents, they say oh, he has a crush on you. Wtf?
Add to it all that he/she completes me. No, you are a complete human being all by yourself. We don't compete each other. We're just compatible, or not.
Thanks for writing this. Indeed, friend zone isn't a gender thing. Being messed up isn't a gender. lol.