CEDICT
the person one has in mind, i.e. one's beloved
Wiktionary
心中所思念或属意的人。晋．陶渊明〈示周续之祖企谢景夷三郎时三人共在城北讲礼校书〉诗：「念我意中人，相去不寻常。」后多指心中所爱恋的异性。宋．柳永〈少年游．世间尤物意中人〉词：「世间尤物意中人，轻细好腰身。」
重編國語辭典
classifiers: 個, 位
She was seen at a restaurant with her lover.
Source: Tatoeba
The two lovers swore to love each other for eternity.