one and only; unparalleled; matchless; without equal

a lover, a mistress / (archaic) a sweetheart, a loved one / (dated) loving people in general

Something not duplicated, being singular

uniqueness

uniqueness

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me