彼(かの)女(じょ) kanojoを o一(ひと)人(り)占(じ)め() hitorijimeしようとする shiyoutosuruな na。 Don't try to keep her all to yourself. Literal Her monopolize try [prohibition-な]. 一人占めしようとするな uses the negative imperative ~な: 'don't try to monopolize.' 一人占め means 'monopolizing, keeping all to oneself.' relationships~ようとする (try to)~な (prohibitive imperative)
彼(かの)女(じょ) kanojoを o一(ひと)人(り)占(じ)め() hitorijimeしようとする shiyoutosuruな na。 Don't try to keep her all to yourself. Literal Her monopolize try [prohibition-な]. 一人占めしようとするな uses the negative imperative ~な: 'don't try to monopolize.' 一人占め means 'monopolizing, keeping all to oneself.' relationships~ようとする (try to)~な (prohibitive imperative)