If you care so much about your privacy, you might consider locking your Whatsapp chat messenger with a password. This will prevent anyone from going through your chats when in possession of your mobile phone.
You can do this easily if you are chatting with Whatsapp on an Android smartphone, be it Tecno, Samsung, LG, HTC, Sony etc All you just need to do is to download the Free Vault for Android app from the Google Play Store.
Once you’ve installed the Vault app, launch it, set up your password, then tap on ‘App Lock“. Tap the “+” icon, select “Whatsapp” from the list of apps displayed and tap “Lock“.
Anytime you want to open the Whatsapp application on your phone, you will have to enter your password.
Hope this helps.