心上人可以说为:
(1)girl friend或boy friend(告诉别人用的)
(2)darling/honey/sweetheart/babe(对方称呼用的)
(3)Apple of my eye(少用一点,可见於歌词/文学作品或圣经)
可是我已经有心上人了
But I have a girl friend (或boy friend) already.
(如果已经订婚,可以说:But I am engaged already或者But I am already engaged to someone else)