I recently saw that my wife had received a late night IM from another man. (How it happened is, I saw a chathead pop up on her tablet, I wasn't looking to catch her in anything,I actually thought we were doing great lately and hope we still are.)

Anyway, seeing the chathead got me curious (because he was unfamiliar, mostly, and I know her friends) so I kind of decided to investigate.

I drew the conclusion that he was evidently responding to something she had sent, because his message was "ok, can we talk on WhatsApp?" but her half of the conversation was gone, deleted,which I found strange.
It was also weird to me that he'd ask to talk on WhatsApp when they were already on the other IM service, but I've heard that some people use WhatsApp for online affairs.

Maybe there is nothing going on, but she's had online affairs before so I have to admit I can't help but be a little suspicious at least, and even though I wasn't initially looking to catch her in anything, if there is something going on I feel I should know for my own peace of mind.