How to tell if two people are talking together?

Hi.
It's impossible but we can be clever...
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wait, he must have a good reason for wanting to know (infidelity or something else) which I hope for you, Ludo
well, I’m currently looking for the same thing but I can’t find it, so if I do, I’ll let you know lol
bye

If we can't see it, there's a reason: to protect and respect privacy!

In short, you're asking how you can violate this privacy...

Personally, I wouldn't respond to you...

Well, we're not going to debate this subject because that's not the purpose of the conversation. Still, I think that sometimes we can allow ourselves to "snoop" a bit for good reasons. Maybe you have things to hide, which is why you're against it, lol! ... Suppose he suspects his friend of having someone; anyway, I won't argue about it... whatever the case, Ludo, if I find something out, I’ll let you know, lol...

"he surely has good reasons to want to know (infidelity or otherwise)"

Personally, I wouldn't call that "a good reason"! For me, there is nothing that excuses spying on someone's conversation without their knowledge. Privacy is sacred. It's important to respect that, no matter the reason (even if you think it's a good one)! I suspect that with reality TV promoting and normalizing voyeurism, this notion is lost these days for some.

Avoiding violating someone's privacy means respecting it. If you're not able to respect it, isn't it logical that they might cheat on you, for example? To me, that's how one should look at things! When you love, you trust! If you don't trust, then you don't really love!

It's the problem with MSN, chatting, and the like.
I know many couples who quarrel because they communicate with others online. It's all part of the "game," but you shouldn't play too much...
It's a matter of trust.
Where are we heading?

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*** Helping you is a pleasure that should remain so ***