I know my partner's phone passcode and he knows mine. I noticed the other day that when he opened a WhatsApp, he had to use his fingerprint to enter the app. It can't be opened by passcode. I asked him about it and he just said there was the option to add a fingerprint lock to WhatsApp so he enabled it. He said I could check his messages but I declined.
I can't help but now find myself worrying about this! I've been cheated on before in a previous relationship so that probably isn't helping.
Would this bother/worry you or do I need to let it go? I just can't see why that extra layer of security is needed other than to potentially stop me reading his messages.