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Am I obligated to return his deposit to him even though he never signed a lease? He sent me his share of the deposit electronically so I cut a check for the initial deposit of the lease.
I tentatively agree with Raster that your roommate may be your month-to-month tenant.

But one question needs to be answered.

Look at the lease. Were both your names shown at the top of the lease even though you were the one that signed it?

That's important.