Boyfriend Privacy

Growing up, my boyfriend's mother would secretly check his cell phone every night. She would look at his texts, browsing history, etc. This has made him extremely private with his cell phone now which I completely understand because he never had that privacy. However, he has done some things in the past that cause me to mistrust him. Do you think his secrecy is normal? Or should I demand him to be more open if he wants this to work?