Maybe he feels like he can still save his farm. I know if I owned a barn and was scrambling to pay the bills...if boarders started looking for another place to board I would be angry with them. Try looking at it from your BO's standpoint. He is losing something he probably atleast likes. Its his business and way of life.
I would be looking but I would want to be 150% sure that it was really going down. There is actual forclosure and there is pre-forclosure. Pre-forclosure is being behind a payment or two. Forclosure means there is no going back.
I guess it really all comes down to how much you like it there. Even if it is just a month behind and the bank sent out notices...it sounds like you don't like the barn very much. It might be worth leaving anyways.
If you like it there, why not have your parents approach him with the 'rumors' that the farm is in the process of being forclosed.