Should I be mad??

This morning I was cleaning my house while my fiancé was at the gym... one of his bank statements was on the counter so I wanted to make sure it didn’t have anything important on it before throwing it out and I saw payments for only fans. We share a checking account so he put it on his credit card(I’m assuming so I wouldn’t see it). This has made me really upset because our sex life isn’t what it should be. I’m on lexapro so my sex drive isn’t that high but I would still have sex with him if he wants to. But I’m just so upset he’s paying for only fans account. He has apologized to me and deleted the account. Am I wrong for being upset/ mad??