Now I completely want something that is saner and stabler and solid and loving.

'I think, before, I probably had that bad boy, dangerous thing, wanting that bad girl. I really have shifted away from that, particularly when, in my experience, you've done that for years and years. You end up angry and miserable and heartbroken afterwards.

'Looking back, I think, 'How did I spend seven years doing that?' and I'm sure the woman I was with is saying the exact same thing,' he said.

Lucas, who had affairs with actresses Salma Hayek and Alexa Davalos in the past, knows that McAdams is the girl for him because he shares so many passions with her.

'Rachel is actually probably one of the most truly committed environmental people I've ever come in contact with in my life. She lives it. We have that immediately in common.'