Gf Thread File The Case After Break up

I'm a Muslim nd in govt service since 2011 nd I'm married yr 2014 .now I have 2 child..in 2016 I'm meet my office girl nd we r friend last 7 to 8 years she all know about me nd my family.. We r in good friendship some yr.. Then 2022 we r like each other then we meet after office..she is also govt servnt.. Then we spend time together some days nd then love each other after some day we do physical relation between us with she wilng we do 5 to 6 time after some days my wife doubt me nd warn me stop this raletion.. Then I'm tell my gf. I can't live more in this relation . She is stop some days bt after she is dispute with me nd blackmailing me to do marry with me other wise I'm file cases against you plz give best advice in this matter