Temperance could also warn that the person's feelings are too strong, advising him or her to ensure that it doesn't become an obsession and doesn't interfere with other parts of the person's life.
Another possibility is that the nature of the feelings is very wholesome, that the feelings are not just a wild passion but also true, meaningful affection. Temperance is arcanum 14 which reduces to 5, the Hierophant, who would advise a traditional and restrained approach to those feelings. Temperance also corresponds to Sagittarius, which implies to me that the person in question sees the big picture - takes the good and the bad and, no matter what, still cares for the other person. Sagittarius could also imply that the person in question feels on some level safe and secure with the person for whom he or she has feelings.
If you feel like really pushing the bounds of what makes sense (as I often do), then Temperance is also associated with the Hebrew letter Samekh whose gematria numerical value is 60, which reduces to 6, the Lovers! From that we could take that love is an underlying theme in these feelings regardless of their outward manifestation.
Just some thoughts!
אהיה אשר אהיה
I am that I am.
ओं मणिपद्मे हूं - ཨོཾ་མ་ཎི་པ་དྨེ་ཧཱུྃ།
Om mani padme hum.