Garba Shehu told local Channels TV that 83 girls were supposed to be freed "but one said: 'No, I'm happy where I am. I have found a husband.'"
The 82 were released as part of a negotiation brokered by the ICRC.
The government agreed to free an undisclosed number of Boko Haram prisoners in exchange.
To read the article titled, "Nigeria Chibok girls: 'One refused to be released'" click here.