Sharing Our Innermost Thoughts

So my husband recently got very drunk and told me that his brother molested him when he was 10 years old. He didn’t give me details, other than it happened more than once for several years. He was sobbing as he was telling me this and he said he’s never told anyone. He doesn’t want to tell his family as it’s been 10 years since it originally occurred. And he said that he has accepted it and moved on. I feel sick to my stomach thinking about how he must have felt as a little boy.
I’ve never met this brother. But I feel a responsibility to tell his wife the kind of person she’s married to, in case they ever decide to have kids. And to maybe get him some help. But I know that my husband wouldn’t like that. His opinion is that it’s over and done. I don’t know what to do.