I know the faucet well....
They are frost free..
Often when a hose is left connected in cold weather, water will not drain from the neck of the valve. Freeze and break.
It will only leak when turned on.
So, I always.. Year around connect, turn on, kink hose and listen. Often besides hearing you can feel the hose does not back up pressure. A sure sign the neck is leaking.
IMO, if this happened to me, I'd roll over and take blame.
I would feel this was my mistake.
But maybe because I know better.
I come across just 5-10 broken valves a year.
Something else I do, because I don't use on board water.
Often I always use my own hose when connected.
But if I used the clients, I always discounted it after use in the colder months. No matter if it was or was not connected before hand.
When using my own hose, I never reconnect theirs in the cold months.
Sorry it happened to you.
I'd take blame, but not offer blame.