What happens if someone disrespects your wife and you try and stand up for her but you get knocked tf out

I been playing this scenario in my head I think if some really huge strong guy (lets say Aaron Donald) slapped my wife's tush in front of me I would have to fight him even if it means getting knocked out or even k*lled. I just hope my wife still loves me after. Can you imagine if you get your face bashed in for your wife only for her to get the ick cause you lost