I wouldn't be mad if my partner cheated on me
If my girlfriend cheated on me with another man (who knows that I'm indeed her man,) and I got to know about it, I wouldn't confront my girlfriend. I would simply go to the said man's home and willingly do some random chore around his house; like mopping his balcony and veranda, or mowing his lawn, or trimming the hedge, or washing his car crystal clean,... and then leave without saying a word.