Good - bad.
Saint - sinner.
Big - small.
Light - dark.
Life - death.
Love - ...
What is the opposite of love actually?
But if think about the best and the worst things in a life, love is definitely the best, but is hate really the worst? At least it's an emotion. The worst thing is when there are no emotions at all.
The opposite of love is not hate, it's indifference.