as far as objectivism in concerned, Love is an emotional response to virtue.
the way Ayn explain it is that a selfless man ( altruism) is incapable of love... as emotions are a function of the self... self esteem is the root of love, self esteem is the result of rational egoism, etc etc etc.
of course, Ayn is the only one to touch on it from that angle either, there are plenty of folks whom have professed things like ' to love another, one must learn to love yourself".. and other related stuff...
I'm not sure Love is a selfish emotion, or a selfless emotion... and I would be hesitant to claim either one is true.
In any event, I don't know the truth.. i don't know if there is a truth to the matter
but I do know objectivism is widely misunderstood, even by self professed objectivists.