DP and I have a great friend, I'll call him Dave.
When we first met Dave 25 years ago he was married with 2 small DC. Sadly the marriage didn't last, we weren't really told why, but was all reasonably amicable and Dave has seen his DC regularly and has a great relationship with them He's a really lovely, good guy.
About 5 years ago Dave's son told us that his DF was in fact gay and had been going to gay bars, clubs and hook up sites. No judging from us, he was a free man. He didn't mention it to us and we didn't question him, figuring he'd tell us if he wanted to. He certainly didn't seem terribly happy at this point in his life and told us he would like to be married again.
He's since had a succession of GFs and has just announced his engagement. The WTB & Dave are thrilled with each other and are excitedly planning a wedding.
My concern is that his new WTB knows none of his history, according to his DS, nor is she to be told. I'm certainly not going to say anything, not is his DS but equally I feel that if I was getting married I'd be distraught to find out that my new husband has a big chunk of history that I knew nothing about.
His WTB is much younger and I think hoping to get pregnant. His elderly parents would find it hard to accept their DS was gay/bi.
Sorry for the essay but any advice would be welcome.