Hold the roses and candy for a second. Saint Valentine was a real Roman priest during the third century. This was just prior to the sanctioning and adoption of Christianity by the Empire. Thus, Valentine was persecuted for his belief and practices. The romantic association evolved from his (illegal) marriage of several Roman soldiers and their sweethearts in the church. For his crimes he was executed, supposedly on or about February 14th.
So, when you wish to be someone’s Valentine, you actually express love unto martyrdom. Remember that for a moment admid the modern, commercial descent into neo-paganism. Add the “Saint” to your amorous expression.