Britney Spears‘ ex-boyfriend Isaac Cohen has said he’s surprised that Britney has gone into rehab but that it’s probably for the best.

Isaac dated Britney for around a month at the start of the year and told People magazine at a party over the weekend: “I was definitely surprised that she went into rehab.”

“I didn’t feel it had to come to that, but you know, if that’s what it takes and if that’s what she needs.”

“It’s the best thing for her, her children – for everyone around her, actually. She’s a strong girl and I really feel that she’ll be okay.”

In related news, a source has told the Star that Britney has admitted to doctors at Promises Treatment Center that she has been bulimic for years and the eating disorder is hampering her ability to take medication for her rumoured bipolar disorder.

The source told the tabloid: “She is on medication for bipolar disorder, but the pills are not staying in her system because she is bulimic and is throwing them up before they can help her.”

“[In the past] she’d pig out on junk food, chips, candy, cola and ice cream, and then she’d feel so guilty, she’d make herself throw up. The only thing that made her stop was when she got pregnant.”