In The Winter's Tale, to what extent does Leontes' jealousy lead to his dowfall?

I think the play makes it quite clear that it is the
irrational jealousy of Leontes that is responsible for the problems that he faces later
on in the play after he has acted on that irrational jealousy. The situation that
Leontes faces seems to be one of his own making. Let us remember that in Act I it is he
that asks his wife to intercede with Polixenes to ask him to stay for longer, and then
he turns around and suspects her of infidelity after he has pushed them together. Note
how the irrational nature of his jealousy is stressed by the way that nobody shares his
suspicions. When Leontes tells Camillo, for example, Camillo does not believe that this
could be possible. Even in Act III when Hermione is formally tried for adultery, Leontes
ignores the words of the oracle that protests Hermione's innocence and proves that she
is chaste and has been loyal to her husband. It is the determination of Leontes to act
on his own irrational and unsupported suspicions that threaten his own downfall and
results in the death of his wife and his estrangement from his
child.