Jackie O. famously said that after the President was assasinated he was the first person to make her laugh. Of course there have been countless rumors stating they had an affair.
Actually Jackie did go out with him..once.It was when her sister Lee was having an affair with Marlon's agent and they all went out to dinner and got drunk and went back to her new fancy apartment on Fifth Avenue..but nothing happened.I guess he definitely felt some remorse about taking advantage of JFK's widow.Good on him.