hack email and only fans account

I had been in a relationship for 8 years and we were scheduled to get married when I discovered that my fiancé was cheating on me with prostitutes. I just had to believe what he said because he deleted the fake account and cleared all the emails. I recently saw that he recovered the fake email. I have the old password for this email and I need to recover all the messages. I would also like to recover his onlyfans account.