Water is very hard to detect, follow and prove. Contact your insurance company. Just ask hypothetical questions. Then you can get an idea how to proceed. They would have to bring in an expert to prove it was your fault.
If it was leaking the question is how bad was it leaking? If it was fixed right away and didn’t linger there shouldn’t really be damage. If it was months till it was detected than that’s another story.
Just be the best neighbor you can be but ya have insurance for a reason.