I have unspent bitcoin in the blockchain I made a transaction from a multibit wallet. It arrived in the blockchain and was confirmed thousands of times. However, the transaction is set to 'unspent'.

Can I retreive this from the blockchain when I have the private key of multibit, or is it lost?

This is the transaction:
https://blockchain.info/tx-index/b2a861b053125b5be9e7ba1b88e655b0e1184973038e3a528b8deb446336ec24

Can anyone help with this?
In short, bitcoin transactions are made up of inputs and outputs. When you sent funds, an input was spent, and the output went to the receiving bitcoin wallet. The unspent tag simply means that the funds that you sent have not yet been used as an input, and the funds are therefore still at the address to which you sent them.