Which lines in this excerpt from John Milton's Paradise Lost reflect Satan's apparent regret that he can never experience love?

Imparadis't in one anothers arms
The happier Eden, shall enjoy their fill
Of bliss on bliss, while I to Hell am thrust,
Where neither joy nor love, but fierce desire,
Among our other torments not the least,
Still unfulfill'd with pain of longing pines;
Yet let me not forget what I have gain'd
From their own mouths; all is not theirs it seems:
One fatal Tree there stands of Knowledge call'd,
Forbidden them to taste: Knowledge forbidd'n?
Suspicious, reasonless. Why should their Lord
Envie them that? can it be sin to know,