Heartbroken with Cheating Girlfriend: Seeking Advice at 30

Hi Anu Myself 38 Male, Government Employee and married. I married to a girl in 2013 as per chosen by my parents. Prior to marriage, I was in relationship of 6 years, but could not marry due to caste differences. Its a bit long story. In last december 2021, a women, 9.5 years elder to me, initiated relationship and proposed me. After few initial days, her husband expired, who was 60 years at the time of death. After her proposal, I accepted it, although, she was in another relationship with a man of 27 years continuously, on the pretext that her husband used to drink, and do not use to work and often used to cast her away from home and that man took care of her and her children. When she entered in my life, I inquired about that and she told me that that man is just friend now, as that man took care of her and her children. One strange thing that came into my mind that women told me that man left her as he got involved in another women and that man is only for doing household and outside chores, and nothing else. How come a person remain in relationship obviously being aware of other partner infidelity. One particular strange I like to share with you that when I met her for first time at her home, as there was no body else, she was with her female friend and that man came to her house, around 10 pm. When she got to know that that man is coming, she hurriedly asked me to leave the house for some 1 and half hours and then come back as she told me that her uncle is coming to pay a visit. I came to know about that man around 10 february, 2021. I totally relied on her conversation that he is only acquaintances now and no more a lover and she totally loves me. After that, she loved me a lot, had physical relationship and she told me that she wanted to live the rest of her life with me. Seeing her love, I also accepted her fully and totally. That other man remained in her life, apart from husband, for the last 27 years. But she used to say ill about him, like he looted her money, got involved with other women, despite her. That used to make me very sceptic thinking that she must be having feeling for him, as together for 27 years is very long time. But her problem is that she is too sceptic a person. she cannot tolerate a name of any women from my lips, let alone my sister. She used to doubt my concern towards her daughter as her daughter is younger to her and I might fall for her daughter. I clearly told her that your daughter is like my daughter. Recently, she started to doubt about my sister in law. I took the oath of all the Gods and my children, but she brushed aside all my Oaths. This was going on from 28 May to 27 June, 2023. She levelled all the filthy allegation that I was having the sight on her daughter and on my sister in law. I also came in rage. She was in the mode of character assassination and I did not take that lightly. I expressed all my displeasure and anger on her and finally, on 27 June, 2023, I blocked her from whatsapp and phone. She is kind of person who would show off about her materialistic things, her status, but in reality, in her bad times, when she was not having any money, I took care of her, her ration and money problems. But being sceptic about relationship with my sister in law, who is just 22 and I call her beta, she was adamant in proving that I was having relationship with my sister in law. She was such a possessive person that she even cannot tolerate my wife with me. She called on my wife phone saying that she is talking from Bank etc. But now, my wife is almost certain that I am having affair. I relied on her thinking that i should give life a second change. But now, I am regretting in relying on that women words. I have blocked her, but she is not trying to contact me from other phones. Help..