War of the Roses: Danielle, Scott and the smartphone

Danielle and Scott have been dating for three years and out of that they have been living together for the past six months. They both live in a one-bedroom apartment and recently Danielle has noticed that Scott has been taking his phone with him wherever he goes and she thinks it's so that she can't see anything on it. At the same time, they recently went out to dinner where Danielle told Scott about how her friend caught her boyfriend going on OnlyFans behind her back and Scott got super-defensive. Danielle then made an OnlyFans account under Scott's email to see if he was lying to her and an account had already been made.

[@chukshartwell3914]

What did he do wrong??