Cheating before wedding?

Found out my fiance cheated on me 3 weeks before our wedding. From what i hear The girl he cheated with he has been trying to smash years now which makes me believe it may be more than just screwing her. A part of me believes he had every intention of continuing the affair with her once we were married. I don't understand why men do this? Why risk it all.. he's already sewed his wild oats before this and he has changed so why now? Please help me understand guys?
Cheating before wedding?
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