Hillary Swank says that substance abuse by her husband Chad Lowe destroyed their marriage.

“I knew something was happening but I didn’t know what,” Swank tells Vanity Fair magazine. She also says her ex has been fighting his problem for years, and he is sober now. She does not name what substance he abused.

I find it hard to believe that she could have been clueless as long as she claims. Maybe she was just absent altogether.

But, she says in excerpts from the interview obtained by the New York Post, “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.”

Swank adds that Lowe is doing well after rehab:

His problem, she adds, is “an enormous obstacle to overcome, and he’s doing it. He’s living a sober life. … I know how difficult it is, and I’m really proud of his sobriety.”

Swank and Lowe’s marriage had tenure on almost all of those in Hollywood.

“It takes two to make something work or not work. I’m a person with my own faults and troubles,” Swank now says. “In the end, it just didn’t work, but I would never look back on this relationship as failed. I look at it as 13 1/2 years of success.”