Beautiful answers.
I would like to add that LOVE is not a HUMAN feeling only - it goes beyond that.
When you look at animals, you can observe an INTENSE LOVE between the MOTHERS and their NEWBORNS. That is true LOVE, which is generated by INSTINCT.
There's a lot of LOVE between animals and humans, too. There can be LOVE between a DOG and a CAT who grow and play together.
LOVE is a NATURAL STATE which is present both in the PHYSICAL universe and in the SPIRITUAL MULTIVERSE.
There's LOVE between SOULS and even between GODS.
Humans complicate things... The rational mind always seeks explanations, and in this process, one can become very confuse.
Because of EXPECTATIONS, a person can live with the impression of LOVE, but instead, he/she is in fact ATTACHED.
The difference between LOVE and ATTACHMENT is truly slim, yet it can be differentiated if one puts his objective thinking on the matter.