My partner is subbed to girls only fans?

I just found out that my partner is subscribed to some girls only fans. I found out when it popped up on his recent websites on chrome. It said on the bottom messages-onlyfans. So I asked him about it and he said that he was subbed to a girl, which is fine. In our relationship the only boundary we have on porn is nothing where there is direct communication and that we communicated. I was only mad Bc he didn’t communicate it with me and I didn’t know if he was directly messaging the girls. I stepped away to calm down during the argument and when I asked to see the messages & he said he deleted his account. I have a feeling he’s been talking to woman on the website… but no proof. Do I go with my gut?