My wife cheated on me and it's my fault?

I'm a 24 year old married man and my wife cheated on me without telling me so. I found out when my cousin showed a proof which explains why she was acting cold. I've been the most caring, loving and thoughtful husband for her, yet her reason for cheating was "I'm too good for you, you deserve to be alone forever!". She also spread lies to her family about me and they hate me now. Girls, what did I do to make her cheat even after my efforts for her?
Updates:
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She's 25 by the way.
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I had enough, she had the guts to physically assault me when I tried to talk to her and I walked out. I'll be getting my stuff from our house and issue an affidavit of ANULLMENT!
My wife cheated on me and it's my fault?
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