For almost everyone, the intense passion and happiness we experience in romantic love fades with time. The feelings we experience at the beginning of a romantic relationship are unique, not just in our imaginations but physiologically as well. In that early phase, the brain makes and releases hormones like dopamine, norepinephrine and oxytocin that give us a relationship-induced high. These powerful chemical substances make us feel happy, energetic and connected to our beloved—what Taylor Swift means by “magnetic force.”
But this hormonal high dissipates. As most married couples discover, the “butterflies” we feel early in a relationship fly away at some point, returning only occasionally. “If passionate love is a drug—literally a drug—it has to wear off eventually,” writes the psychologist Jonathan Haidt. And then, many couples falsely conclude, “If the magic ended, it can’t be true love.”
Source: “Don’t Buy the Soul Mate Myth,” Wall Street Journal.
I college I read that infatuation follows a similar profile to opioid drug use in that the effects of a dose diminishes over time. I suspect people who try to chase that initial high lead lives equally destructive.