Its quite personal, I m too young and inexperienced in this particular matter so you can ignore my suggestion.
I would suggest to ignore her , have peace with your life , you lucky to find out now enjoy your life .and believe in karma it do hit hard whenever it does
― George R.R. Martin, A Clash of Kings
+1 women have a superpower in India that is 498A- dahej pratha case. According to a survey >98% of cases under article 498A are false.
So I would suggest op to keep calm (which is very difficult in this situation) and focus on divorce case. His 6-7 years will be ruined if he gets in to this. Better talk to her calmly and ask her to divorce with mutual consent.
After divorce just move on, let karma decide her faith.
Life is very short, op should not waste it on a dishonest person.
It's more of a normal thing if you see around. Even most of my friends have extra marital affairs, (even incestuous ones, yes you read it right) and logic is that it brings satisfaction in their happy marriage. Although I disapprove it but I assume it's the generation disaster, whole lot of apples that has gone rotten. I don't know about woman much because I never touched one but I can still ask you to man up and bear this treachery without letting it eat you up from the inside. End the marriage gracefully and look for a better new beginning, if you again crave for any woman's embrace. Forget about revenge, it will naturally come to them, once you take off your overcast upon them. Now they are thinking that they have to fool only you and dealing easily with it. Once you take yourself out of picture, it will be them and the world ( which I know is the most cruel thing)
Simply, move on, any thoughts you making for destroying them would eventually consume you only. Socho jab hamare pujyaniya bhagwaan log ek biwi ke saath shanti se nahin reh paaye, toh hum toh bas insaan hi hein. Socho socho!