how do i cope with a cheating girlfriend?

about 2 and a half years ago my girlfriend cheated on me. i was away and she was fucking this dude on the side. when i came back i hear stuff from neighbors friends and family. well she admitted to it after i got mad cuz i got warts (warts are from HPV) but here it is almost 3 years later and it makes my blood boil still.how can i cope with this. and learn to forgive and forget? im still with her we have two kids. i also went to health dept and got warts burned off

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