In Shakespeare's Romeo and Juliet, in what ways does Romeo fit the description of the tragic hero, and how does he not fit the description?

In Aristotle's
Poetics, the author indicates that the tragic hero is a relatively virtuous
person who moves from a state of good fortune to a state of bad fortune.

The change of fortune should be not from bad to good, but,
reversely, from good to bad. It should come about as the result not of vice, but of some great
error or frailty... (S. H. Butcher translation)

This is
certainly true of. He is no saint, but he is certainly not a depraved sinner. At the outset of
the play, he is in relatively good fortune, although he is unhappy about the way his love life
is going. This unhappiness, however, is...