I believe, as I have read, that Love is the opposite of Selfishness.
There are so many different explanations around of what love actually is. But, at the end of the day, selfishness cannot exist in real love.
In the Ancient Biblical writings of 1 Corinthians chapter 13, love is talked about quite freely. It clearly says there, too, that "love is not selfish" and "love seeks not its own interests."