你知道我喜欢你很久了
[nĭ zhī dào wŏ xĭ huān nĭ hĕn jiŭ le]
'You know I've liked you for a long time' reveals persistent unrequited affection. This heartfelt declaration signifies lasting infatuation or romance. The tone can range from earnest vulnerability if waiting for acknowledgment, longing for reciprocation, to being open about longstanding feelings toward another individual without necessarily expecting anything in return.