The former 'Beverly Hills 90210' actor started dating his now-wife when she was just 18 and the couple broke up in 2009 as he was worried it was all too much for her, but they quickly reconciled.
He said: "The reality is, she was 18 when I met her and she went through an enormous change in her life. just her career in general and going from being a girl who - when I met her, she was living in New York doing 'Hope & Faith' and we'd go to restaurants and I was the person everybody would recognise and point and laugh at or whatever.
"And all of a sudden that turned around and she couldn't go anywhere and her name and her face were everywhere. So, she went through the natural period of, 'I'm not sure if I'm ready to be in such a settled relationship.'
"I didn't want her to feel like she was stuck because she said she wanted to be in a relationship to begin with and we just never really went in different directions. We'd say, 'Oh, let's kind of take a break and see what's going on.' It always came back together."
Another reason Brian briefly split with Megan was because he was concerned she was taking on too much as he had a son from a previous relationship.
He said: "I have an eight-year-old, he was two at the time, when Megan and I met. She helped me raise him and it's a huge responsibility. There was a lot to it."
Despite their short break-up, the couple - who married in Hawaii in June - are now happier than ever with Brian gushing to US TV show 'Access Hollywood': "She's amazing."
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