Charlize Theron and Sean Penn
From 2013 to 2015, Charlize Theron and Sean Penn were just head-over-heels in love with each other. In fact, they were very good friends when a romantic relationship started to blossom between them. It was completely natural. They may have gone their separate ways in June 2015, but that only happened after Penn proposed to Theron in Paris, France a few months prior to their split. Interestingly enough, the actress even denied ever being engaged to him during an interview with radio host Howard Stern.
We may never know the real reason behind their split. However, Theron did admit that she had no plans of ever marrying anyone ever. It was never an important milestone for her. Penn must have given her credit for her honesty. These stars were just not meant to be, but they are clearly happier apart.