Whilst I agree with this, I am conflicted because I think the same reasoning also leads to the opposite conclusion. What does it actually mean for him to say he is gay? Is he leaving his wife? Is he going to stay with her but start having sex with men? If neither of those things then he is gay in the same way that I’m an out of work actor — I might have a theoretical preference to be paid to be on stage but there’s no action that can evidence it. If your and my sexuality is relevant because we are monogamous, so is his. There are a hell of a lot of people out there that love each other deeply and stay together because their relationship gives them support and love but no longer have sex. It may be a little sad for one or both of them that this is true, but it doesn’t define them. They don’t need to tell the world about their lack of sex and come out as asexual. In short, sexuality literally doesn’t define anything about you other than who you want to have sex with, and if you’re in a sex-free relationship, at that point any status of heterosexual or homosexual is purely moot.
On the other hand, if he is leaving his wife then I’m actually even more confused. It would seem that he loves her dearly. It seems surprising to me that the pull to sex — especially with an as yet unknown person — is so overwhelmingly important to anybody above the age of about 25 that it’s worth throwing away your entire nurtured, loving family existence in order to achieve it. I mean, if somebody wants to do that then I’m not going to condemn them for it, that’s up to them. But neither am I going to congratulate them any more than if it were any 57 year old man who was bored of sex with his wife and seeking a bit of adventure with another woman. Prioritising sexual desire over everything else strikes me as a thing you have every right to do, but not particularly praiseworthy as such.
So the thing I am conflicted on — to the extent that it is anything to do with me at all, which it isn’t, and the extent that I therefore need to have an opinion, which I don’t — is what he really wants from his life as he moves forward into his 60s and beyond, and why this is best achieved by announcing his sexuality.