gut feeling

i know my bf of almost 2 years isn’t over his ex. i can tell. i know he checks her social media every now & then bc he’ll tell me his cousin told him that blah blah posted this or that. recently he hasn’t been telling me things anymore. i called him out for being on his “cousins” finsta and found out it wasn’t even his cousin.. he told me he would never go on it again but i can see him switching in between instas. she recently made an only fans and i have a feeling he looks at it. i always see a reflection of her hair color bc it’s a crazy color & he goes into the bathroom 600x a day and turns the sink on and he hides his phone. the thing is idk how to ask him if he’s hiding something without him getting defensive and starting a fight, also i moved in w him last august bc i was about to be homeless & i feel like if i told him i wanted to leave he’d disrespect my things and i honestly have no idea what to do. i have to cats and my parents aren’t in the situation to help me.