Mohsin From Mumbai want legal help in Divorce / Marriage

I want divorce from my wife , 7 years of marriage , n I found my wife cheating on me , in 2019 I found some chats and I asked her what is all this … she accept that she should not to do this n everything was good after that , but recently again I found she’s cheating on me with the same guy , I found some call logs … but no chats or anything , now she’s saying we are just friends. …I cannot be in such kind of relation .
My problem is I have two kids one is 6 years old n other one is 3 years old , I want my kids custody to be with me anyhow . I need proper way for divorce . I believe she has a multiple personality problem also . Before marriage she used to take medicine for some mental illness( when she’s angry she say many things which makes a person breaks into prices but suddenly she ask for forgiveness.