Treat your relationship as if you are growing the most beautiful sacred flower. Keep watering it, tend to the roots, and always make sure the petals are full of color and are never curling. Once you neglect your plant, it will die, as will your relationship.
Where there is love, there is justice - where there is no love, there is no justice. And love is the purest form of expectation-less kindness, hence kindness itself is justice. So, to be kind is, to be loving, and to be loving is, to be just. Call it love, call it kindness, call it spirituality, call it justice, it's all one.