So lets say that a Chad gets beaten up by a bloatmax weight lifting low tier normie, in front of his gf. Will his gf start to feel less attracted to Chad due to his weakness (inability to protect the progeny), and start to feel attraction for the stronger more physically dominant male?

There are many stories of girls leaving their bf or feeling less attracted to him, due to him being beaten up by a stronger guy, though usually it's the normie beta who gets destroyed by a gym Chad so it's not clear to me whether it's due to looks or a display of dominance.