Picture this scenario.
Your partner / husband or boyfriend tells us that when he was a small kid – maybe 8 yrs old – he got sexually abused by his older brother (3 yrs).
He tells you this in confidence. Not even his own family know. All that time he kept such a secret.

Now many many yrs ago – his brother gets in touch with through a search friend internt programme.

I really dislike him for what he has done…

Is it wise to mention to him that I know or leave it??

The only reason I would want to tell him I know – is that to show that his younger brother didn’t not tell anyone – he told ME

No,I would not tell.It's up to your partner to decide if he wants to open this bag of worms.It will only cause problems for you and your partner.He probably told you,hoping he could talk to someone ,without worry that you would tell anyone.

You are right!
The only reason I want to tell his sick brother that I know is for him to know that he hasn't got away with it.
And somebody knows!

I have to be nice to him when we meet - luckily its not often as we live in differnet countries