The Old Testament talks about ‘Eye for an Eye’, but with Jesus Christ's death on the cross and subsequent resurrection, God has demonstrated His supreme love for the world by sacrificing His son for our redemption. 

The Lord has loved us since the day He created Adam, but we are the one who moved away from his love.  

Jesus commandment to ‘Love one another’ should be seen in the context of the Lord, sending Jesus to die for our sins. God wants us to follow his example and love one another as He has loved both the righteous and the wicked among us. If seen in this background it is a 'new' commandment.