Jessica Simpson has spoken out about her fears during her and Nick Lachey's marriage-breakdown.

The singer was scared of upsetting the couple's perfect-marriage façade, she explained.

"I never wanted to let anybody down," she recalled to US Weekly. "But then you just have to realise that if you're not happy, you can't make anybody else happy.

"When you walk away and there's no gravitational pull, then you know you're doing the right thing."