Cellphone issues

Would you question your SO about their phone if they always have it on them? He goes to shower and he takes his phone with him, it’s always either in his pocket or with him. I don’t know if it’s my anxiety or I’m overreacting but it drives me crazy! We’re newly engaged and have a newborn. He always says he would never cheat or do anything to disrespect me...but it’s not like someone would tell you what they’re doing. It just bothers me, if you have nothing to hide they why is it always on you.