Wife's Past Affair - Should I Be Worried?

I need some help regarding my married life. My wife had an affair in Jan 2018 with my brother's brother-in-law. In May-2018 I came to know about this. From that day to till date she has kept me away from her. From last year she is talking properly but also avoiding me. She doesn't like my touch. We haven't have sex from 2018 till date. Please let me know what I should do.

My wife had an affair before marriage. She did not tell me about it. After marriage, when I asked her, she admitted it but said she had no feelings for him any more. How can I trust her when she did not tell me before marriage? Should I divorce her? L

I have been married from last 20 years. It's arrange marriage and before marriage told me let she had an affair with a har college friend dena hai asked that if any relation physical relation has been done she said no I trusted her and married her but after 4 years of marriage I am notice that she didn't paid any attention or don't love me I always thought that there are some mistakes from my side that's why she behave like this . From last 16 years I was suffering from the situation. Recently I come to know when I saw her mobile accidentally and I come to know that she has the same affair from last 16 years with the same guy when I ask about this she told me that it was by mistake I am sorry I won't do this again after some pressureise she also told me that she did a physical relation with him before marriage and after marriage too. I was shocked cause physically I am fit and capable to satisfy her with all the way still she cheated me. Now she confess me all the things and told me promise me that she won't do any mistake henceforth. But no problem is whenever I am trying to get physical or emotional with her some thoughts in my mind game that she did all the things with another guy and cheating me so I can't make any relation ship with her. How can I trust her again we have to kids 10 year each. Please tell me what to do I am frustrated