Alex Pettyfer finds love complicated

Alex Pettyfer thinks love is a "complicated thing".

The British actor - who split from his 'I Am Number Four' co-star Dianna Agron last week - believes relationships are more difficult than they need to be because circumstances always interfere with situations.

Speaking before his break-up with the blonde actress, Alex told BANG Showbiz: "It's a very complicated thing, love. There's always something trying to muck it up."

Alex, 20, met Dianna on the set of the new sci-fi movie - in which he plays an alien named John Smith, who brought to earth to escape a group of killer rivals - last year and he admits he fell for the 24-year-old beauty's "classic" star quality.

He added: "She's this kind of old, classic movie star. She brings this lightness to the movie and I think that the romance on screen is something that is a beautiful thing because even though my character is superhuman he is reluctant to be so.

"The thing that John's destiny is, he's destined to be this warrior but he just wants to be a normal kid. The more he falls in love the more his legacies kick in and that's a great dynamic."