Actress Naomi Watts always knew her failed romance Heath Ledger was doomed, insisting they both "knew that there wasn't a forever plan".

The 21 GRAMS beauty, 37, and fellow Australian Ledger, 26, dated for just under two years until May 2004, with the BROTHERS GRIMM star finding love with his Brokeback Mountain co-star Michelle Williams just a month later (JUN04).

Watts explains, "I think deep down we both knew that there wasn't a forever plan.

"It was not an easy break-up but, you know, a bearable on. It's sad saying goodbye to someone that you care for, but we always knew that it was in sight, so it was the inevitable that happened."