Rumours of a real-life romance between Cooper, 30, and Seyfried, 23, started making rounds after the pair was spotted together at a restaurant in Bath. And now, Joanna Carolan, 30, Cooper's girlfriend of 13 years, has spoken about the break up in an interview with Grazia magazine.
"I've cried a lot of tears and have woken up to the reality that the future I wanted is never going to happen," The Telegraph quoted her as saying. She added: "Life changes, people change and success does things to people. You have to decide whether you can put up with that - and I couldn't."
Carolan revealed that when Cooper returned from filming, they got back together and she assumed his liaison with Seyfried "would be a five-minute fling". Also, she said that she "took it for granted he'd end it with Amanda. He'd say he had and then I'd hear through friends he hadn't. I had to kick him out. I'm no longer in love and can''t think about taking him back. I can''t be with a man who''d let me go through this."
Abba inspired Mamma Mia!, also starring Meryl Streep, Colin Firth and Pierce Brosnan, was one of the biggest hits of 2008, and became the best-selling DVD ever. In fact, Seyfried's two-year relationship with musician and actor Jesse Marchant saw a tragic end owing to the Cooper and her relationship.
"He's a low-key guy and I was entering into this world of celebrity which he hates and which scares him. I didn't want him to be unhappy or have to deal with it, and so it was me who ended it," said Seyfried.