In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Imaam Muhammad Ibn Saaleh Al-Uthaymeen [rahimahullaah] said: Celebrating Valentine’s Day is impermissible due to reasons: First: It is an innovated celebration and it has no basis in the Islamic legislation. Second: It is a call to infatuation. Third: It is a means of preoccupying the heart with the likes of these insignificant affairs and it is in opposition to the guidance of the Salafus Saaleh [The Pious Predecessors – the first three pious generations of Muslim (i.e. the Prophet and his companions, then those who followed the companions and those who followed the followers of the companions]. Therefore, it is impermissible to initiate anything on this day related to (celebration), whether it is foodstuffs, drinks, clothing, exchanging gifts or other than that. It is obligated on a Muslim to nobly (adhere to his (or her)] religion and should not be one who goes with the flow- following everyone who calls to something. [Ref 1]

Shaikh Abdul Waahid Abu Khadeejah [may Allaah preserve him] stated: Valentine’s Day, also called St. Valentine’s Day, holiday (February 14) when lovers express their affection with greetings and gifts. The holiday has origins in the Roman festival of Lupercalia, held in mid-February. The festival, which celebrated the coming of spring, included fertility rites and the pairing off of women with men by lottery. At the end of the 5th century, Pope Gelasius I replaced Lupercalia with St. Valentine’s Day. It came to be celebrated as a day of romance from about the 14th century. Although there were several Christian martyrs named Valentine, the day may have taken its name from a priest who was martyred about 270 CE by the emperor Claudius II Gothicus. According to legend, the priest signed a letter “from your Valentine” to his jailer’s daughter, whom he had befriended. (Ref: Encyclopaedia Britannica)[Ref 2]

Listen Here: Valentines Day – A Pagan Practice- By Ustaadh Abu Suhailah Umar Quinn [hafidhahullaah]

Valentines Day – A Pagan Practice | Abu Suhailah Umar Quinn

[Ref 1: An excerpt from (Majmoo Fataawaa 16/199). slightly paraphrased]
[Ref 2: https://www.abukhadeejah.com/ibn-taymiyyah-on-participating-in-the-annual-celebrations-of-the-unbelievers/ ]