Nowhere :) In my opinion there is no love :) All emotions, feelings, reactions of human are summed together and called as "love", but in real there is no love. People who "loves" each other, in real they like being together, spending time, because they have common interests, good relation etc. That's why there are so many couples, this is clearly biological reaction :) :) We, humans, don't like being together, and this is the reason :)