How is sugar in fruit metabolized, or digested and used?
Do you mean fructolysis?

Here what I found on the textbook  by John L. Tymoczko: 

Fructose can take one of two pathways to enter the glycolytic pathway.Much of the ingested fructose is metabolized by the liver, using the fructose 1-phosphate pathway. The first step is the phosphorylation of fructose to fructose-1-phosphate by fructokinase. Fructose-1-phosphate is then split into glyceraldehyde and dihydroxyacetone phosphate, an intermediate in glycolysis. This aldol cleavage is catalyzed by a specific fructose 1-phosphate aldolase. Dihydroxyacetone phosphate continues into stage 2 of glycolysis, whereas glyceraldehyde is then phosphorylated to glyceraldehyde 3-phosphate, a glycolytic intermediate, by triose kinase. In other tissues, fructose can be phosphorylated to the glycolytic intermediate fructose 6-phosphate by hexokinase.