someone who really just seems like they dont like you but yet they go out with you anyway. And every day you'll get so scared that you'll loose them even though you love them but you can't fully commit to them or anyone else just in case they don't feel the same way as you.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.