How do I check who my friend is chatting with on WhatsApp without touching their device?

Lately they’ve been extremely guarded with their phone, and I’m worried they might be talking to someone unsafe. I don’t want to invade their privacy by physically grabbing the phone, and I’m hoping there’s some technical workaround that lets me see their conversations remotely. Is there any way to do that without ever having the device in my hands? I’d appreciate practical advice, even if it’s a blunt “not possible.” Just trying to keep someone safe without crossing a line.