I see red flags AIBU?

[Esspee]

OH’s daughter is lovely. I like her very much. About 10 years ago she met and married her second husband. They couldn’t have been a better match in interests and personality. They made their blended family work most impressively.
They are close friends with a couple who live/lived nearby, the ladies are like sisters they are so close so nights out, holidays away, everything was done as a foursome.
Just a month or so ago the other couple split up. The husband was a rather wet individual and the wife who is lovely will no doubt be better off without him.
OH’s daughter’s husband started taking care of his appearance and lost stones in weight over the last two years and now looks amazing. His wife has remained the same so they no longer look well matched.
Today she mentioned to me how much she enjoyed her “me time” while her husband and her best friend go out to a hobby together.
Immediately I started seeing red flags but couldn’t bring myself to say anything. AIBU?

You think their hobby is fucking?

Oooh I see what you mean (but did you mean to be so mean about OHs daughter?). Tricky. What was his motivation for losing weight? Do you know why the other couple split?

Oh dear. I means it's really hard to give an opinion when you don't know them personally. What's the hobby? How often? Do you think the daughter has any suspicion at all?

Beak. Out.

I think you need to not get so involved in other peoples lives . You may be right but you may also be massively jumping to conclusions. Don’t get involved especially with absolutely no evidence.

I think you should voice your concerns to her. This does look like trouble brewing. You obviously care. I don't agree with other posters that love means letting other people sleepwalk into disaster. I think love means addressing difficult topics especially when someone is sticking their head in the sand.

Seriously - keep your nose out. She's an adult and you're just her father's partner, no more. She wouldn't thank you for speculating about her marriage on the internet, and she's presumably got eyes in her head and a brain so she's already well aware of any changes in her husband's looks and behaviour.

I know from experience that it takes a long time for the penny to drop with this kind of thing. I am not suggesting that anything is going on but the potential is there which sends out red flags for me.
I don’t intend to say anything except perhaps she should consider joining them to get out of the house.
I really just wondered if anyone else would consider the situation potentially dangerous.

You might be onto something but you are just going to come off as nosey and the villain. Leave it alone

What's the hobby and how often do they do it? If an hour once a week with a load of other people then YABU.

I'm erring on the side of YABU anyway though because of your comments about her weight. Like that has anything to do with how likely a partner is to cheat, and how 'well matched' they are.

So I wouldn't say anything to her as it is likely to be interpreted as 'you best lose weight before he goes and fucks a skinny girl'

I think you should tell her that now her hair s and is hot as fuck, and she’s clearly a lazy fat cow, that it’s pretty obvious her husband is fucking her best friend.
See how that goes down

Now her HUSBAND