Every year Valentine's Day falls on the 45th day of the year, February 14. It's a day reminding every couple of the cultural expectations of a relationship, which in our society include; materialism and marriage.
The word 'love' has gematria of '54', the reflection of '45'.
The value / concept of marriage comes from spiritual texts, such as the Holy Bible.
Keep in mind the Catholic Church has much in common with the Jewish faith, who go by the 39 Books in the Old Testament.
One day it is a 'Valentine', the next it is a 'wedding'.
When you write out 'thirty-nine', it has gematria of '142', kind of like the date 'February 14', or 14/2.
As for Valentine's coming during the 3-days of Lupercalia, I have a thought on that. Keep in mind the festival begins February 13, the 44th day of the year.
Remember how Beyonce and Jay-Z were married on April 4, and how Kanye West and Kim K. were married on the 144th day of the year?
Last, here is the numerology for Valentine's Day 2017.
2/14/2017 = 2+14+20+17 = 53 (Religion) (Cupid)
2/14/2017 = 2+14+(2+0+1+7) = 26 (Cupid)
2/14/2017 = 2+1+4+2+0+1+7 = 17
2/14/17 = 2+14+17 = 33 (Diamond)