How can I change her?

this is a girl I love so much but now she has started cheating on me. she always say if I can't cope with her new life then we should break up. she has offended me on many occasions but I forgave her each time. I provide her with everything that she will demand, we have seen the pastor, family and friends for advice but she never changed character. WILL THIS GIRL CHANGE AND HOW I CAN HER CHANGE?
How can I change her?
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