Help sold my car and not sure if safe?

Sold my 1997 Honda to a man today for $$$. Problem is I just read on Virginias dmv site that I have to do a title transfer? Not sure if this is necessary or not. I got the bill of sale and made him sign the title. I have his address and number. I got my tags also. I have informed DMV of sale and insurance. Am I responsible if he never registers vehicle if he gets in accident?

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