Good for you, FF, in not participating in the drama triangle.

It's interesting what a swath of destruction pwBPD can leave in their wake. And it's not pleasant to be tarred by association that you may be just like her. It sounds like you established that difference with your communication with the horse guy.
I can imagine it from his side--that the amount of money you're paying to board there is not worth the aggravation of dealing with a drama queen and a young man who ignores what he asks.
Good that you used the nuclear option of stopping funding this unless your wife could fix it!
