The opposite of
love, an
intense emotion, would be not be a different
intense emotion, such as hate. To love something, one must
invest a lot of time and emotional energy in it. The same is true of hate.
Hatred also takes up a large amount of time and requires a huge
emotional investment.
Apathy really is the opposite of both love and hate. The lack of any sort of emotion or investment in a person or thing is the polar opposite of love and hate.
Of course, I don't like binary oppositions, so I probably don't really believe what I just said.
Eh ... I guess I believe it a little more than what's been said so far, at least.