Jealousy in romance is like salt in food. A little can enhance the savor, but too much can spoil the pleasure and, under certain circumstances, can be life-threatening.
Who loves the golden mean is safe from the poverty of a tenement, is free from the envy of a palace.
[Lat., Auream quisquis mediocritatem deligit tutus caret obsoleti sordibus tecti, caret invidenda sobrius aula.]