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Meg Ryan says ex-husband Dennis Quaid was unfaithful to her in their marriage.

"Dennis was not faithful to me for a very long time, and that was very painful. I found out more about that after I was divorced," the "When Harry Met Sally" actress tells the new issue of InStyle.

In 2000, Ryan, now 46, had a romance with her "Proof of Life" co-star Russell Crowe; the affair ended her marriage to Quaid (with whom she has a son, Jack, 16).

Of Crowe, she says: “I think he took a big hit. But Russell didn’t break up the marriage. He was definitely there at the end, but it wasn’t his fault. I was a mess. I hurt him too at the end. I couldn’t be in another long relationship, it wasn’t the time for that. So I got out.”

She also talks about her daughter, Daisy, whom she adopted from China three years ago.

"I don't feel like I adopted a child. I feel like I just got this unbelievable companion," Ryan tells the magazine. "Daisy is brilliant. This kid says things every day that make you just stop and stare at her."

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