Ladies I need y’all help

I have a gut feeling my boyfriend has an onlyfans subscription. Last night he didn’t go to bed until 5 am and whenever I came out he was hiding out in the laundry room and would come out to make jokes or start a small conversation. I checked his email and he sent $135 to some female. I’m sure he deleted his history and I just want to know how can I recover it back so I have proof? I’m already leaving but I need solid proof so he won’t say that lady is a family member or some dumb shit. I forgave his ass the first time I caught him on Reddit being sexual with other women. Stupid fken me.