Natalie Portman couldn’t care less about her ex-husband’s dating life. According to an insider, the “Black Swan” actress is unfazed by Benjamin Millepied’s recent passionate kiss in Paris after the couple called it quits in August 2023. “Natalie isn’t surprised that Benjamin has moved on because of how their relationship ended. She thought he’d move on pretty quickly,” the source shared, referencing how their relationship allegedly soured because of his affair with climate activist Camille Étienne. “[Portman] hopes Benjamin is happy,” the insider said of the actress’ reaction to seeing photos …