I always felt that was a weird “holiday” to celebrate love.
The gubmint told him to not perform the sacrament of marriage, and he did it anyway. God won't be denied, even in the face of death.
The fact that that defense of the faith has been shape-shifted into a day to celebrate love isnt TOO far removed from the principle.
If I really wanted to be dogmatic, only men and women in their first marriage should celebrate St Valentine's Day. That discussion can be saved for another day.
Card companies manufactured it.