Husband filed divorce petition by abondoning me and my son

Married in 1997 and since then residing in Pune. We have a son as only child born in year 2000. Presently, my husband is 51 years and myself 46 years. Husband was into business which fetched nice profits, but due to his poor financial management all the earnings lost in some or other ways. His 2 brothers were also staying with us who helped him in business. To help out finances, I started doing small scale works and finally got job in Central Government on contractual basis in the year 2000. Entire house was running on my salary. I had to do house chores, take care of newborn kid and also go to work. I did it for family values. Husband tried various business, made money but was unable to hold on to it and lost in some reckless investments in a greed to become millionaire overnight. During 2016 he ventured into crypto currency for which I took loan of about Rs.10 lakhs. This clicked and today he is holding huge amount of money. He insisted me to resign the job and again for family values, I resigned in the year 2017 and we moved out to Goa and stayed there for about 3 years. Now that he got hooked-up with some married lady with 2 kids, staying in Bangalore, he started forcing me to sign divorce petition on mutual grounds. I curtly refused to do so. Post lockdown in June20, he left me and my son in Pune and went away to Bangalore. Now he had filed petition for divorce in Pune making very false and frivolous allegations. I have no job now and at this age it is very difficult to find one. He is not giving a penny for our maintenance. Please guide me to get justice in this scenario and restore our family and secure mine and my son’s future.