But, the law remains intact and valid even today. That Jesus fulfilled the law does not mean we are not called to fulfil it ourselves. What changed is only the methodology of fulfilling the law.
Christ Jesus gave us a new commandment, to love one another because it is through love, the whole law of Moses is fulfilled. Even Paul in Romans 13: 8 - 10 tells us to love one another, for he that loves another has fulfilled the law. Continuing, he said, for this, you shall not commit adultery, you shall not kill, you shall not steal, you shall not bear false witness. you shall not covet, and if there is any other commandment , it is briefly comprehended in this saying , you shall love your neighbour as yourself. Love works no ill to his neighbour therefore love is the fulfilling of the law.
This is very straight forward.