What does "想問伊人何處" mean? There's this song in Chinese with these lyrics.

起雲動劍下虎嘯龍吟
誰知成敗早已是天定
想問伊人何處
離愁漸遠漸生
但願人長久情常在
無悔無憾


What does the phrase "想問伊人何處" mean and connote? I understand this song to be sad.
伊人 is lover.

想問伊人何處 means: I want to ask where is my lover.