Yiddish: They are both in love: he with himself and she with herself.

SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.

‏‏זיי האָבן זיך ביידע ליב: ער זיך און זי זיך.

Zey hobn zikh beyde lib: er zikh un zi zikh.

They are both in love: he with himself and she with herself.