We know that Voldemort does not love. He does not understand it, nor (generally) the magic that it possesses. He knows nothing of the sort.
[...] "you possess in such quantities and which Voldemort has not at all." [...] "because he could not bear to reside in a body so full of the force he detests. In the end, it mattered not that you could not close your mind. It was your heart that saved you."
(Harry Potter and the Order of the Phoenix, page 1075)
The above confirms it (although I believe there is a better quote), though this clip reinforces it. The fact that he hugs so awkwardly shows that he does not really know how, due to his lack of love.
I realize that Voldemort's appearance started to change after he started to create Horcruxes, but surely he had an ounce of love when he was a child? The hugging scene perhaps shows that he never once loved his whole life (possibly due to the love potion with his parents?). If so, when did Voldemort begin to have no love at all, and why?