Handling deposits

[Monique S.]

I rented my SFH to a dating couple. Six months later the man moved out and requested "his" deposit back. He was told "no" by me since he was breaking the lease. The woman has stayed on. When the lease is up and she moves out do I give her the full amount back or locate the man and split the deposit back between the two of them? I'm pretty sure it was all his money put up for the deposit. What are my legal obligations?

Thank you