Amanda Seyfried and Justin Long have ended their relationship [1], Us Weekly reports. According to a source, "It happened a few weeks ago. He's [Justin's] really heartbroken." The duo started dating two years ago [2] and were often seen being goofy [3] with each other during casual outings. The last time we saw Amanda and Justin together was back in May when they stepped out at the Costume Institute Gala [4]at the Metropolitan Museum of Art in NYC. See all the other famous couples who have split this year [5].