But this is not a draw!!! It's a sure win for black. As chess masters often (annoyingly) say, "The rest is just technique."
Your opponent was not wrong to resign unless he thought you would throw away the win. Perhaps he was complimenting you by resigning as he assumed that you had the skill to win. Do you think he was wrong to assume that?
(kaŝi) Se vi restigas la musmontrilon sur la piktogramo pri lia membreco, aperos ŝpruchelpilo kun liaj ĉefaj detaloj. (pauloaguia) (Montri ĉiujn konsilojn)