Caught him

I really need your guys opinion on this... I live with my boyfriend & this morning I was awakened by an email from his phone he’s REALLY BIG on not going through each other’s phone so I try not to look through it.. even though sometimes when he’s asleep I’ll casually roam through it 🙄 but anyways, it was from “” and I thought it might just be spam mail? But no I was wrong ... he made a profile 😤 he can’t do anything on it until he actually makes a payment in order to chat or whatever but idk if I should be mad? Do I bring it up to him? I know if I do he’s gonna be like “well why are you going though my phone “ can already hear him... what do I do?