While most are familiar with St. Valentine's association with love, he was more widely known as an intercessor against dangers.
This is clear in the official prayer composed by the Catholic Church for the feast of St. Valentine. It is a prayer that is still used today in the Extraordinary Form of the Roman Rite (Latin Mass), on February 14, the day which the Church formerly celebrated St. Valentine on the liturgical calendar (his feast was removed from the general calendar in 1969).
Besides asking for St. Valentine's intercession for the love in your life, ask him to protect you from danger.
Grant, we beseech you, O almighty God,
that we who keep the festival of your holy martyr Valentine,
may be delivered by his intercession from all dangers that threaten us.
Through Our Lord Jesus Christ: Who lives and reigns with you in the unity of the Holy Spirit, one God forever and ever. Amen.
