"Mine own.—I know not why, nor whërefore."
Nor is the necessary addition of Rowe.
"One sand
Another not more resembles ... That sweet rosy lad."
This punctuation, I think, removes all difficulty. In the perturbation of astonishment he stops short, and then tells whom he meant.
"This man is better than the man he slew."
For the first 'man' we had better read youth.