Sri Sri Ravi Shankar: Love is something which is present everywhere. Sometimes it can arise from imagination, sometimes it can arise spontaneously without any reason. Sometimes it can arise by just seeing someone or while resting it can arise. Sometimes, while taking a walk in the evening or while the sun is setting something might stir inside your mind, or it can also happen in meditation.
Love is your very nature; it is there within you, and around you, eternally. So when, what will become a reason for love to blossom, cannot be said.