Matt Damon believes "bad choices" have ruined Ben Affleck's film career.The 'Bourne Ultimatum' star thinks his friend has suffered from picking the wrong movie roles and from the media attention surrounding his relationship with ex-lover Jennifer Lopez.Damon said: "He picked things that in hindsight weren't a good choice."I also think that if you end up on the cover of gossip magazines you're f**ked."When people see you all the time there's no mystery about you any more and no-one's going to want to go and see your movies."Damon and Affleck both made it big in Hollywood when they wrote and starred in 'Good Will Hunting' in 1997, winning an Oscar for Best Original Screenplay.Since then Damon's career has taken off with a series of box office blockbusters, including 'The Departed' and the 'Bourne' trilogy, while Affleck's film 'Gigli' - in which he co-starred with ex-fiancée Jennifer Lopez - was a spectacular flop.

Damon and Affleck plan to collaborate in the future, but are yet to start working on a script.

Affleck, 34, is now married to fellow Hollywood star Jennifer Garner, with who he has a 20-month-old daughter, Violet Anne.

Damon, 36, is married to former bartender Luciana Bozan.

He is stepfather to her daughter Alexia, and the couple also have a one-year-old daughter Isabella.

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