Wife separated from family

I have completed 17 years of joyful marriage life having two children of 16and 11yr old. In 2017november I found my wife texting msg and had illegal contact with local guy. I warned her but stayed with me. After 2months she visited her parent house and told them as I was not forgetting her mistake.her parent believed her compromised then brought her back within two days.after seeing her parent support she again started illegal contact and showing disrespect on me. Oneday when I visited my home surprisingly she is on the way to meet him. I warned and came to office. But she took poison.neighbours intimated and I rushed to take her hospital and saved.but in ICU she called that guy from nurse phone and planned to go with him. Her parents also visited hospital they came to know her real face.then we went to police there he told my wife lied as she had second marriage with me and having no child. He writtten a letter as he wont interfere further. We shifted home from that area. But my wife showing mum. I told her forget past and live happily. But she didnt believe. May be guiltiness she shows no interest.as repeatedly asking she never giving answer.oneday she suddenly went to nearby ladies hostel and started to going job by leaving us, basically she is arrogant. Last six months I tried to talk her and messaged to forget past. She is avoiding me, her parents also tried but still she is in hostel. What to do for reunion legally. She is my uncles daughter only. Her habbit is never accept even very small fault.