Help....this guy is blackmailing me?

well....am 22yrz married n has a son who's 2yrs. my hubby is abroad at the moment. i met a guy(28yrs) through a chat site and we became good friends n he started calling me n smsing me n then he said he's into me alot n he said that he loves me...n v started a secret relationship. ive met him two wise n one time we slept together. after that he stopped calling me bt he msg'd me all the time. recently i lied to him coz i was chattin with another guy n believe me i had nothing to to with this new guy...i didnt tell him bcoz then he would wanna know from a-z about this new guy n it might be a prob to this new guy. coz the guy i slept with is having conections with lotsa political heads(bad ppl)...so howeva i lied to him n kept the new friend a secret. he suspected something n he asked me to tell him the truth...n i finally gave in n told him everything including y i lied to him....then he gt pissed with me n totally told me off through sms. we didnt sms eachother for like a day n then he sms'd me wishing happy valentines day....so i wished him back. he said for me to send him a email saying everything about my new chat friend...n i did bt i regret it now. n yesterday i stopped chatting to both these guys n i told my hubby about everything n he forgave me n said to neva speak to them ever again. oh n i also told my mum abt it. bt now that guy is calling me n smsing me threatening me that he will tell my hubby everthing n that he will put my picz on the net. what should i do? i messed up big time n now am paying for it. but how can i get out of it. he wants me to call him n tell him y i stopped talkin to him all of a sudden bt i dnt wanna talk to him coz i knw now that he's a player who triked me into the whole thing n he never loved or cared for me bt he was only using me for . what should i do? pls help. oh bdw...he's not married.