Perfect Couples and Best-friends: Flavors that are made for each other and are often seen together; one precedes the other.
-Chocolate & Hazelnut
-Butter & Honey
-Lime & Cilantro
Odd Couples: Unconventional or unintuitive matches that go great!
-Cheese & Fruit
-Salt and a Margarita
A Friend Group: A group of flavors that goes well together but any two individual flavors in the group aren't necessarily destined to go together.
-Curry
-Apple Pie
Divorced Flavors:
I recently found a couple of flavors that are so awful together that they are forever divorced in my mind; Balsamic Vinegar and the Anise/Licorice flavor (fennel, anise, Thai Basil). Balsamic is like a sweet but really complicated person while, for instance, Thai Basil, is fresh but dominating and lacks the ability to appreciate the vinegar's complexity; as a couple the basil sours the balsamic and the vinegar turn the basil bitter. It's an awful, awful combo.