Blackmail

Hello sir i am suffering from a serious mental issue. first of all i am feeling regret for being born on this earth. i have d1 big mistake sir.i got married 3 years back. i have a son. my age is 28. due to lack of time we are not happy with sex life in last 1 year. recently through online i met a girl who is of 22 years age in some dating website. i had sex with her. i was connecting with her through email only. did not reveal any of my identities to her even my original name and contact number also. i created 1 new email for that dating website purpose. today i got a mail from some boy mailing me that he is having a video of my sex d1 at that place and telling that he is going to give it to the police. i did not reply any thing . just pretended like who is this etc etc. i am not understanding what to do sir in this situation. i am regretting my self for keeping an extra marital affair with some girl for 1 hour time. and now this guy has mailed me. i know that this new email was given to that boy by that girl only .they are playing a game i think so sir. please advice me what to do sir