Love happens at many levels. Intellectual, emotional, social etc but these things are at the higher orfer of the being. The feeling we get are like every piece of our whole bodies wants to bond at the cellular level like we are part of each other.
Have you every wondered at what level a cell has some kind of conscious existence and how it feels about the cells it is intimate involved with? Surely they feel some sense of being in this all together.
Some would thing that there is no conscious at the level of a cell but consider this. A single cellular organism is quite capable of pursuing its prey, fleeing from danger, conjugating and reproducing. Is this not evidence of some form of consciousness yet without a single synapse involved