LOS ANGELES, California (X17online) - Kevin Federline is talking about his life with ex-wife Britney Spears, and how he reacted to her very public breakdown.

In the new issue of People magazine, Federline says his two children, 3-year-old Sean and 2-year-old Jayden, were his biggest concern when he split from the pop star.

"My first question to [my lawyer] was, 'Am I ever going to be able to see my children?' I told him that I would spend every last dime that I had to make sure that my children are okay. That's all that mattered. I didn't know how much power Britney had. That really scared me," Federline told the magazine.

The former back-up dancer also said watching Spears' seemingly out-of-control downward spiral was difficult for him, particularly the night Spears locked herself in a closet with Jayden and was later taken to the hospital.

"That whole night is a blur. You want to talk about one of my lowest points of depression, that was probably one of them," Federline revealed. "I was very, very worried for her 'cause I care about her. That's the mother of my children. Just because I'm not in love with her doesn't mean that I don't love her."

But despite their past, Federline is still very supportive of Britney.

"I'm definitely rooting for her," Federline said. "There's nothing more that I want than for her to be in the best health and doing what she loves to do."