ULPT Request - I suspect someone might be pretending to be his wife in sexy WA messages with me. How do I find out?

I linked up with a guy on Reddit (alt account) who said he and his wife wanted to do sexy stuff with another guy. (I know it sounds implausible at face value, but context is everything so please stick with it.)

I convinced him to chat over WhatsApp instead. Once I had his number, it was quite easy to find out his full name and his (well-established) Facebook account, and I could easily verify that he is who he says he is across multiple sources. I also found his wife's Facebook account. I don't think he'll have worked out that I know his real identify, because I have a few lesser-known tricks for finding this stuff out.

(Meanwhile, he has no idea who I am, and I'm using an alt name and WhatsApp number.)

From there, I convinced him to put me in touch with his wife. This is where things get a bit tricky.

I've been texting her, and we've had lots of fun. We've traded naughty pictures as "view once". Her naughty pictures are ones that she's previously shared with her husband. And we've chatted about life etc. Supposedly, the husband knows we've been in contact, but doesn't know how long it's continued and how steamy the conversation has gotten. But he'll be involved when we all meet in the same city.

I've started having some niggling doubts though. The way the messages take ages to be delivered suggested that she might be using an alt WhatsApp account too. And if it's an alt WhatsApp account, who knows? maybe it's not hers, but the husband's.

So I did some more sleuthing, and managed to find her real number online. On WhatsApp, her real number has her picture, and a status update from 2022. The alt WhatsApp I've been texting has no status update so can't be dated.

So how do I find out?

The obvious way is to just message the real number saying "do you know who this is", but if it's all genuine she'll be weirded out and block me. Any suggestions?

Tl;dr: the husband gave me his wife's number for WhatsApp messages, but it's not her real number. I suspect it might be him pretending to be her.