What does the young man mean by “great honey-coloured /Ramparts at your ear?” Why does he say that young men are “thrown into despair” by them?

The “great honey-coloured/Ramparts at your ear” refers to the beautiful yellow coloured hair that falls at the woman’s ear and cover it like a fence around a fort. He says that the young men are “thrown into despair” by them because they look so gorgeous on the woman that her beauty gets methodically improved. The young men fall in love with her and feel despair. He says that it is impossible that someone would love her and not her yellow hair.

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