Tsuki-Dei said: I don't think she was the actual wife... Maybe an obsessed ex-girlfriend trying to stop the wedding?
Story here is obvious: 1) Groom agrees to marry bride out of fear because the bride is a batshit insane yandere 2) Groom talks to friend/therapist/mother, and they tell him that he shouldn't accept her abuse and shouldn't let the woman control him 3) Groom thinks about this and right when the priest asks them if he wants to spend eternity with the woman, some bout of courage comes into him and he says "No". 4) Bride takes out a sword and starts swinging it at the groom and kills him (the guests run out, which is why there are none behind her in the picture)
Or it could go your way, but that route is overused.