My advice would be,
if there is no relationship between the two of you now, a correction from so long ago wouldn’t be as readily received as it would have been in the moment.
You could instead ask God to have mercy on that individual by name, and then make it a point to say a prayer in reparation to the Holy Name of Jesus whenever you hear His Name blasphemed. Have a daily devotion to The Holy Name as well to repair for past, current and future offenses.
Also, when you encounter this very common problem again, have a short fraternal correction ready to go for those taking God’s Name in vain.