How to confront her Fiance?

I'm seeing this girl that is engaged, her current relationship is toxic and everyone around her knows it and that's why I felt it was a good thing to pursue her. Now, at some point I expect her fiance to confront me since he already saw us close together once (before we really developed feelings for each other) they had a fight and he broke her engagement ring and abused her emotionally. Anyway, should he one day confront me after they break up, what's the correct way to handle it.
How to confront her Fiance?
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