An adorable theory about why we say the phrase ‘to the moon and back’ in relation to love is taking over TikTok. The expression is often said when telling someone how much you love them, to represent a huge amount. Cute ‘to the moon and back’ theory“Currently crying because someone just told me that your heart pumps 2,000 gallons of blood a day, which is equivalent to the amount of gasoline it would take to drive from earth to the moon and back,” a viral TikTok video says. “So when someone tells you they love you to the moon and back, they are basically saying they love you every time their he…