My boyfriend won’t let me see his phone

Avery

My boyfriend and I have been going out for a couple months and it’s going well but whenever I go on his phone to take a picture of us or someone will send him a text and I’ll try to read it to him if he’s busy doing something just small things like that but he gets noticeably upset and anxious and grabs his phone away from me. I’ve never gone through his phone before or anything but now I’m really curious to what’s going on I’ve asked him and he just denies he does that