Please I sent btc to a particular wallet, initially it was both showing unspent but I only see one spent now what does it mean?
That means that you have spent (sent to another receiver or address ) one of the two funds and the transaction spending this one fund has been included in a block and recorded on the blockchain and this doesn't belong to you anymore. The other unspent fund belongs to you and you can use it whenever you want.
P.S: If the wallet to which you sent the funds belongs to you.
To know more about this explore how UTXO in bitcoin works.