In "Sonnet 35," what does the speaker long for even though it causes him pain?

In the opening lines of Spenser’s “Sonnet XXXV,” the
speaker states, “My hungry eyes, through greedy covetise/Still to behold the object of
their pain.” He speaks of an unrequited love, a woman who, when she is near him and his
eyes may look upon her, causes him to “pine” for her, and yet, when she is absent, his
eyes “complain” at being deprived of her image.  The pain he speaks of is the
unendurable longing he feels for the object of his desire; when he sees her, he
laments,

Yet
are mine eyes so filled with the store
Of that fair sight, that nothing else
they brook,
But loathe the things which they did like before,
And
can no more endure on them to
look.

So, in her presence
everything else that surrounds the speaker becomes loathsome to him – nothing in the
world has the right to exist, in his eyes, but the woman he adores.  And yet she is
unavailable to him, and the limitations of his relationship with her – that is, being
only able to look upon her, and nothing more – cause him great pain.  He longs to see
her, her figure is the only thing in the world that is fair and good to him, and yet
even the simple act of seeing her distresses him, for he cannot have her.  “So plenty
makes me poor,” he states, comparing himself to Narcissus, who starved to death, so
absorbed was he in his own reflection.  In a similar manner the speaker is starved of
all happiness, all pleasure, so absorbed is he in this unnamed woman’s presence; a love
as unattainable as a reflection in a pond.