Hubby paying for behind my back...?

Got a bank statement saying I was overdrawn by nearly 100 quid today, couldn't understand where it came from so I rang my hubby who claimed no knowledge of it. Being a guy normally sensible with money I umed we were victims of internet fraud, as the money was going to two seperate websites over a few days. Went to bank, cancelled cards, had a rite good ol panic and tried to work out how I could make up the shortfall being the main breadwinner in the house. Anyways the money was being taken off my hubbys card and the woman at the bank asked me if he had used the card. I stood up for him and said adamantly that he had not bought anything over the internet and I wanted something done. Gets home and tells the hubby, who confesses he bought a free trial (his words) that cost him 1.50, nearly 100 quid ha come out of our account in 3 days. He swears he only suscribed to hustler free trial, yet money is flying out. What should I do? I have no objection to , but lies n secrets I do.....