Damage done to my condo while it was for sale. Who pays?

My condo was on the market for 3 months and I never got an offer, which was odd as it was priced fairly, was staged nicely, etc.

First clue something was amiss, I get electric bill, which is more than my own house! So I go over and the bed is unmade, linens balled up and thrown in corner, towel on shower curtain rod. It looked like someone was either living there part of the time, or using as a place for a tryst. My realtor denied knowing anything and claimed they never saw the "lived in" things I just described. Now I see that the sink in bathroom is cracked, must have started as a hairline crack and w hot and cold running, crack has spread. The sheets, duvet cover, and sink all need to be replaced. Is it unreasonable to submit the expenses to my realtor? Or is it on me to check a property all the time to make sure stuff like this isn't happening.