What is the chance to get divorce and what is the cost of alimony for my case.

Hello Sir, I get married on 2016. Now, We want to divorce to live rest of our live separately. We are still residing at same house. My Details : 1. I am an Engineer , having 8+ years of experience. Currently working in a Govt. Organization as a clerk with monthly salary 26,000.Joined Govt Organization on 2016. 2. My Existing loan Details : I am paying 17000 INR/Month as an EMI for Car, Personal loan and loan from my relatives. 3. No such asset in my name.My house where we are currently living is my parental house. 4. Father Passed away and mother is living with us, she is a pensioner. My wife 1. Graduate from Distance Learning (BBA) and more than 8 years of experience in various renowned private company as Back Office Executive, Customer Relationship Manager,Sales Executive etc.monthly salary around 15000. 2. Currently unemployed. Leave her last job 6 months before of our marriage. 3. Her Father and mother are passed away when she was 10 years old. she has one brother , but he does not want to contact with his sister for various reason. 4. After her parents passed away she was living in her maternal house. But after 2001 she started living on PG and then in rental flat. 5. She is eligible for family pension because her father was a Govt. Employee and she also a stakeholder of her parental house. Cause for divorce. 1.Hide Information : a) She did not informed me that she is older than me for 3 years before marriage. b) Earlier she has married with someone else and lived with him for more than 1 month and then separated on the year 2004. c) She also hide information about her family and relatives. 2.Extra Marital Affairs : a) Before our marriage she introduce me with a person and represent him as her brother, he was already married and have a child of age 15 years that person interfere regularly when she and me come outside.Sometimes he also follows us.He goes to her flat without any time limitation, Drink over there and stay with her. I raised so many question for this relation before our marriage but every time she and that person comes to me and try to understand me that I am thinking wrong and prove me as a guilty,I believe those thing because I truly loved her. He is also arrange and take highest responsibility for our marriage from her side. After marriage once she come to my house then she and that person contact regularly on phone beyond our observation.At the time of honeymoon I got her email account and reveal that she and that person is in a love relationship and also physical. I contacted with her family member and they told me to check further.Still she contacts with him.