Why does the heart, or a heart have antyhing to do with love?

wondering, i love sending hearts to people i love, and receiving them, but why?
Answer
Could it be bcoz when ur in luv it beats faster? (like in the car ns when it jumps out ov their chest lol) or maybe its coz sumone who cant feel or love is basically devoid of emotion, dead inside and sumone without a heart is dead therefore, love=emotion=life=heartbeats i dunno - a random guess lol peace x