Guillaume Canet reckons he can be a nightmare to be around when he is directing.
The French filmmaker has made three films, including 2006's Tell No One and Little White Lies starring long-time girlfriend Marion Cotillard, and credited the Oscar-winning actress for her understanding.
"The cast were all so great, especially Marion. It was really hard for her because when you share the life of the director, when you come home from the set you want to have some rest," he said.
"You don't want to have someone coming back home with the dailies (raw footage) and talking about all of the problems of the day and the challenges of the day after."
Guillaume, who welcomed his first child - son Marcel - with Marion in May, revealed the job doesn't get easier despite having more experience.
"It was so hard, it was not easy at all. I'm quite obsessive, I'm never really satisfied. I never felt any outside pressure on the other films because I put so much pressure on myself," he admitted.
The 38-year-old also found the film's subject of relationships quite challenging.
"It's a movie that I started to write because I was in a period of my life in which I realised that I was focusing too much on work, rather than enjoying life. It's been really difficult because I was talking about a subject that was very personal for me..." he recalled.
:: Little White Lies is available on DVD and Blu-ray now.