Looks like you're going to get your first experience with retraining a cowboyed horse.
My ex husband was exactly like your fiancÚ. I ende up divorcing him for many reasons. One of them being his roughness with my animals. It transfers to humans eventually, you know.
From now on, fiancÚ doesn't handle your horse at all. You now have to restart him from the ground up. Retrain him in everything. Leading, lunging, saddling, mounting, etc. Hes a nervous wreck now and your dear fiancÚ made him that way.
If he turns his butt to you, crack him on it with a whip. He will understand that every time he threatens to kick, he'll get nailed. Then go about business as though it never happened.
Good luck on restarting him. If a crow hop scares you, take him to a trainer next time, not a bronc rider.
With the amount of knowledge you seem to possess and your timidness towards a crow hop, I'd suggest a trainer anyways.
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