Some sweet fruits are best eaten withour citrus...but then avocado -kinda a fat fruit is great with oranges (blood oranges!)
I once read all the combination rules of fruit and veges for digestive acids to work best
Now I eat what I like- I'm really getting to a place that I am honoring my intuition to guide me properly and I am trying (with mixed results) to stay in a happy emotional place (higher vibration) and then the rest does take care of itself!
But if I was eating nothing but fruit I think it would be a splendid idea to get a book on fruit combination