Amanda Seyfried has had a few notable relationships in her dating history, but nothing too long-term. She first dated actor Dominic Cooper in 2007. The two were together for two years and even moved in together.
After her split with Cooper, Seyfried dated actor Ryan Phillippe for a brief period of time in 2009. In 2010, she was linked to actor Josh Hartnett, but their romance was short-lived and they went their separate ways shortly after.
In 2011, Seyfried began dating actor Justin Long, who she had worked with on the movie Going the Distance. They dated for two years and split in 2013. After that, she started dating Mamma Mia co-star Dominic West, who she was with for about a year before the relationship ended.
In 2015, Seyfried began a relationship with actor Thomas Sadoski which culminated in their marriage in 2017. The couple welcomed their daughter in 2017, and are still happily married.
Overall, Amanda Seyfried has had a few relationships throughout the years and is currently settled down with her husband and daughter.