My wife is having illegit sexual relationship with another guy. I am in different town and she is in different city. I came to know she is having sexual relationship with another person. As a man what shall i do. Please guide

Hi , I am a professor mech engineer , after death of my wife and due to having 5 year girl baby I planned for 2 nd marriage as I live alone away from home town because my of job with my little baby . I accepted a widow having 2 child ,she was working in a govt job 250 km away , after ensuring and agreeing her possibility of transfer and job vacancy @govt office near my house and ensuring she agreed that she will come to live with me along with her 2 kids and my little baby as her trasfer was due in comming few months . We lived apart during her job at 250 km away.,while meeting on weekly offs 6 /7 time in 6 months , then she take 360 degree u turn and said she will not get job transfer to my place and get her trasfer in other dept. in same previous office. And started telling many reasons like she will loose her children's inheritance in her in-laws property ,she will loose promotion , kids Don't want trasfer , and said we will live apart forever . This was contradictory to earlier agreed things .and my my purpose to live in family with my baby not fulfilled , so after long ruckus ,I mutually got divorce from her , Then After divorce I decided to marry non working women having no child and don't expect child as I am @48 year old and tired of living alone and managing job ,girl , house chores . I married to a divorcee girl from Pune ,she was BA first year college drop out girl of 44 yr age after 6 months of long dating on week ends . During 6 months I tried to know her indepth but was don't used to talk much as I was trying to know her true nature, we visited many places ,movies . She seemed perfect as per my requirement of girl wanting no child , and she is house wife . after marriage she behave well for 1 st week ,then she started trouble to hate my baby ( became kaikai )on pety things , she want my baby to house chores at the cost of her important year of 10th std study . She don't liked me taking tution of girl , she didn't like if I help my girl any way . She don't like if I spent some money on my girl . She used to fight all night and don't let me sleep . Now she stated demanding that she want baby , though I was against and b4 marriage agreed to not have any more child due to old age ,cost ,and no personal time for self , then I agreed to have child but b4 that I got her and my fertility tested ,she had weak eggs and syst on her reproductive organs and doc warned to not go for pregnancy due to risk and probability of unhealthy baby birth , but she kept repeating That she want child we consulted 4 Drs. She used to fight and go to her mother's home for 2/4 months after living with me for 2/3 days only . Now she wants divorce , and asks me to keep my girl in hostel if I want her in my life . This Ramayan has left me baffled , What should I do ??? .....