My horse used to listen to my leg so well now he won’t even walk anywhere except back to the barn:( Does anyone have any tips or might know why he does that?

Do you have a coach? If not, get one even for a couple of lessons. This isn’t due to a nagging leg or other things, it’s the rider not having the skills to address the fact they’re letting the horse get away with things. You’re always training a horse or untraining it. So basically, MAKE him listen to your leg and don’t take no for an answer. Expect him to balk at first because he’s gotten away with it and won’t understand why he still can’t.
He might be frightened by somrhing that wasn't there before but is now just a suggestion
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