This is now known as the "friendzone". It was only bilateral.
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"A bilateral friendship" does not exist. There is mutual friendship. The term "friendship" is used only when someone is hypocritical, depicting friendship, and mentally comes out of poison that he will not go out in gratitude for pretending (although, the object may not be better and use the situation dumb for "doying" - you do not need to defile the memory of good relationships with such pseudo-synonyms.