"By the Lord, thou art a tyrant to say so."
For 'tyrant' the 4tos read traitor. I have adopted this reading, though dubious of its being the best.
"What thou wert if Fortune thy foe were not, Nature is."
So also Capell.
"I love thee, and none but thee."
The metre proves this to be the right text.
"So, now uncape."