A source close to the two told Us Weekly, "It happened a few weeks ago. He's really heartbroken."
Another insider said of the split, "They had different schedules and different lives. They just grew apart.”
Amanda and Justin became a couple in the summer of 2013 with the help of Instagram. She shared in Vogue's June 2015 issue, "I thought something he said was really funny. It was a beautiful picture of a snail, and the caption said, 'F------g MOOOOOOOOVE.' It made me laugh out loud, so I texted him."
Seyfried also admitted to the magazine that her career made it challenging to date. "Making movies is two solid months of 12-, 14-hour days. I mean, it can ruin your relationship."