Why do ppl "LOVE"?

LOVE IS DEFINED as the emotion of strong affection and personal attachment. Love is interpreted many different ways by many different ppl...how u see love is how u interpret it (at least in my opinion). As a child if u see a man hit a woman & she keeps running back ur going to assume that the love of that couple is based on anger just as if u grew up watching a promiscuous woman parading around diff men using sex to keep them then u think her love is based on sex/sexual favors...of course LOVE for all of us is deeper than that...its all of our emotions wrapped into one; Emotions of anger, happiness, sorrow, vulnerability, ego, frustration, fulfillment, hope, doubt, depression, confusion, etc. Theoretically our brains are designed to control our sensory neurons...when u see something that sparks ur senses u react & u take the necessary steps in order for u to gain some sort of goal. Animal/Primal instinct, makes us no different than other species EXCEPT for the fact that humans have more of an ability to interpret, reason & rationalize/ put things into perspective. We've labeled our affection for each other as "like": "I LIKE him/her", then when it becomes more than "like", its "lust", with the ending result SOMETIMES being LOVE, where we go above and beyond for one another bc now we're in "LOVE"....seriously though LOVE can mean anything we want it to & it can be defined as whatever we deem fit. Ppl "LOVE" bc its part of our natural instinct to have affection for one another u "love" ur mom, ur dad, ur brother/sister, bff, etc. It's simply an action given a name. But what if it wasn't called love??? Then we'd all just _______ each other. Now y do ppl "LOVE" so hard???? That's another question...