If you want to see your lover’s Whatsapp messages, there is a trick to do that. You can spy on your lover using Whatsapp.
You can use Whatsapp web
Whats you need
You need a PC (laptop or desktop) with internet connection
Open the browser
Open Whatsapp on the phone, and go to Whatsapp Web
Scan the code on the computer
and you are good to go
You can give them their phone afterwards. But you can see the messages as long as they are online.