Mutual Seperation

My husband had mailed me asking for mutual separation and that he wishes to move ahead in life. I'm yet to join work and still in my maternity and LWP leave. Last year, while still pregnant, he bought a house on his parents insistence which is still under construction. We were both not on same page regarding the house since it was out of city and moving in and commute was an issue due to no development in and around. The house is registered on his name and I'm not registered for reasons he knows best and not provided inspite of requesting. Since last 4 years, he and his parents have been throwing me of the marital house every year. He would later come and take me back asking to let bygones be bygones. Since last year, I've stopped staying at marital home because I could not take it anymore to thrown out of the house. We have a child who is 8 months old. They never wanted to have a kid ,few medical reasons, financial and his personal reasons or ageing. Now all of sudden they are showing interest in kid as people are asking them about child. After I shifted to my mother's place for maternity, not once did he come to meet our child. His mother interferes every now and then with terms and conditions not acceptable to me. We have tried marital counselling 4 years back, but it didn't work. I've tried calling, but he doesn't pick my calls. They also have withheld original birth certificate of my child. Inspite of requesting for the original scanned copy, they would not send it as it is. Kindly guide the procedure for mutual separation and formalities. Is mutual separation and mutual divorce same? I knew my marriage was not working but I was ready to give an year to it for the sake of my child. He doesn't know what fathers love is.