This is where the idea of "espionage" begins. An attacker does not need to hack WhatsApp’s servers; they only need to trick you into scanning their QR code or gain physical access to your phone for a few seconds.
If you feel the need to secretly monitor your partner’s WhatsApp, the trust is already broken. Spying will only cause legal and emotional damage. Seek couples therapy or legal separation advice instead. whatsapp web espiar