We see it all the time on Facebook: people share loved-up selfies with their partner, proudly declaring in the captions that they were “so lucky to fall in love with my best friend”.

However, some might question whether it’s a good thing to declare that your ‘bae’ is also your BFF, especially if your partner replaces other friendships – and Anna Faris certainly doesn’t think it is.

The actor – who separated from Chris Pratt in August after eight years of marriage – has reflected on some of the lessons she learned from their relationship in a new book, Unqualified. And, in an excerpt shared with Cosmopolitan, Faris writes about friendships and why Pratt wasn’t, and never needed to be, her best friend.

“I was once told that I didn’t need a tight group of girlfriends because Chris should be my best friend. But I never bought that,” she explains.

“The idea of your mate being your best friend – it’s overhyped. I really believe that your partner serves one purpose and each friend serves another. There’s the friend you confess things to and the friend with whom you do the listening. Or this is the person I talk to when I’m feeling lonely and sad, this is the person I talk to about work s**t, and this is the friend I’m still in touch with because we grew up together.”

Anna Faris explains why Chris Pratt was never her best friend