15 Celebs Who Just Can’t Figure Out Monogamy

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6. Josh Hartnett

While some celebrities tone their behavior down after engaging in a serious relationship or when they get married, others just can’t help themselves even when being committed is expected of them.

Take Josh Hartnett’s case for example. The star of “Pearl Harbor,” “Black Hawk Down” and “Bunraku” managed to score a girl like Scarlett Johansson back in the day, but the actress/sex symbol simply wasn’t enough for Josh’s ambitions.

Their relationship ended after two years in 2006 when the American actor was spotted fooling around with an unknown woman on the set of a movie. He remains unmarried to this day and we just can’t imagine why.