Chad Lowe's addiction caused split with Hilary Swank

Now we know why Hilary Swank and Chad Lowe called it quits. It wasn’t because occasional TV guest star Chad was jealous of two-time Oscar winner Hilary’s successful career. Swank has confessed to Vanity Fair that it was actually Lowe's "substance-abuse" problem that caused their marriage to come to an end.

Swank never names what substance Lowe abused, but does claim that he kept his addiction a secret from her. "When I found out, it was such a shock because I never thought he'd keep something from me. And yet, on another level, it was a confirmation of something I was feeling that was keeping us from being completely solid," she says in the interview.

Hilary says that Chad is now sober and that his addiction was not the only reason for their break up. "I don't want to make it seem like that's the sole reason; there were other factors.� Swank says. “But that just kind of blew it open. It made me look at things a lot deeper. That's when you realize it's not going to work."

Hilary also addresses the rumor that her success may have caused a rift in their relationship. "Chad is very supportive of my career. He is, I think, genuinely happy for my success...I think that any frustration for him stemmed from the lack of opportunities in his own career," she told Vanity Fair.