Assuming your partner does have a secret diary (.. weird..) !
Most Helpful Guy
I would be tempted to but I wouldn't0
Most Helpful Girl
Absolutely not. We've lived together for 6 months and I've never even looked in his drawer in his nightstand. I don't think he has anything secret in there but it just feels like it's his space so I just don't snoop in there. If I happened to find a diary I wouldn't read it. Same as I wouldn't root through his mail or snoop around his phone or social media.1