spouses cell phone

We just got married, I've had reasons to not trust him in the past. I know I know, why am I with him, but 99% I trust him. but tonight I asked to see his phone and he usually just gives it to me, but this time he said no. that made me really sad, he's always checking my phone and I have nothing to hide. i am just heart broken that he was so against giving me his phone. now he's tagging me on facebook to his friends that we're married, like trying to make up for what's he hiding. i don't know what to do :'(