I wouldn't recommend deluding yourself that you can genuinely be friends with someone you're romantically attracted to.

Some people may be unable to handle that and should move on if it's a constant romantic craving that isn't reciprocated, but I still contend that other people can, do, and should enjoy having friendships even if they may have started as romantic gestures that weren't reciprocated.

To broad-brush declare it's impossible seems needlessly antagonistic.