i dont know what to do..

so in my relationship im very open about my phone, I have nothing to hide from my husband. usually he just gets on it and looks at my bank app and that's it. but when it comes to his phone...its always glued to him. always takes it to the bathroom. he never leaves it within my reach except for when its on the charger at night, and even then he turns it off. he wouldn't even let me put directions in his phone while he was driving and I was in the passenger seat...he said he wont let me look at his phone purposely because I keep asking to do it but I've only asked 2 or 3 times in the past ...am I wrong for wanting to look at his phone? I usually trust him so much but he lied to me over something so stupid (buying cigarettes) and since then he's been acting like this with his phone and I just can't shake this feeling that something is going on....our anniversary is this weekend so maybe he's just planning something and doesn't want me to see but idk...ugh am I wrong am i overreacting what do I do 😭