Valentine's Day 2024: Origins, Background & Traditions - Is it a big thing in your European country?
Valentine's Day 2024: Origins, Background & Traditions | HISTORY
In Germany, at least im my region, Valentine's Day almost exclusively exists in media, mostly with US origin. Same as with other occasions popularized by it, there are special sales and Valentine's Day specific stuff to buy in supermarkets. But I never talked to anyone who makes a big deal out of it.
In Catalonia, the day of lovers isn't Valentine's day but Sant Jordi, in April: https://en.wikipedia.org/wiki/The_Day_of_Books_and_Roses