For thousands of years, love, passion and marriage were considered a rare and usually undesirable combination. Valentine's Day was originally envisioned by the Roman Catholic Church as a check on sexual passion. Even though young people centuries later turned the holiday into an occasion to celebrate romantic love and sexual attraction, few of them expected to marry on the basis of such irrational emotions. Almost no one believed that falling in love was a great and glorious thing that should lead to marriage, or that marriage was a place to achieve sexual fulfillment.
Read it. Then give her that box of chocolates and the Hallmark card (or him; hey, whatever!), and pay no attention to the historian behind the curtain.
It's a lovely idea. Even if it does make us all nuts and keep the divorce lawyers in business.