la douleur exquise; (french): the heart-wrenching pain of wanting someone you can't have.
one watched far ahead of their so-called 'crush'. well, that's what people may call it. but to that person, the one who they love could be their everything. they love them so much that it hurts their heart to not have their love.
this is unreciprocated love is too unbearable for one.