The emotional dependence between two people
Love is the deep emotional dependence that develops between two people.
Love is an unmistakable feeling. It is not an emotion because emotions like anger, happiness and sadness have clear causes. Love does not necessarily have a causal link to any specific stimuli. And it does not increase or decrease depending on the environment you are in. Therefore, it falls into the realm of feeling rather than emotion.
Love is a raw sensation you experience when you meet the right person. It is not simply physical attraction, but a result of physical attraction, emotional connection, deep respect and admiration. It emerges without warning when you meet someone you fall in love with, and it recedes just as spontaneously when these feelings dissipate. 
Reducing love to a sensation that comes and goes means we are passive in the experience. Love is simply something that happens to us. But that is not accurate. Love can be something we devote time and energy to. We can choose to fall in love and stay in love and take steps to ensure that happens. We are not passive in the experience but incredibly active.
[P1] Love has a distinct feeling that is distinguishable from other feelings. [P2] Therefore, love is a feeling.
[Rejecting P2] Feelings are something we have no control over. We have control over love. Therefore, love is not a feeling.