Need suggestion on Divorce with employed wife.

Dear Sir, I am into an unbearable situation. I got married in Jan 2019 to govt employed wife. She is pregnant now with 5 months . I am also working in private company. Her income is more than me. After my marriage, she is not listening my words. And she is talking with her boy friend more times and also have relation with his. I talked to her parents, they don't say any things to her daughter. my questions are: 1.Do i have to pay any maintenance to her (she is govt employee) 2. We are almost living separately, how much time will it take if we apply for divorce with mutual agreement 3. In case, if she does not agree for mutual divorce, how should i proceed to apply for divorce. Please, talk all possible ways on this issue. please suggest me all possible ways.