In the first stanza, Byron uses a metaphor when he refers to himself as "broken-hearted." His heart of course is not literally broken, but the metaphor here helps to convey how mournful and disconsolate he feels.
There is also repetition in the first stanza. The speaker says that his lover's kiss grew "cold, / Colder." The repetition here emphasizes the point that the passion seemed to drain from the relationship.
In the first stanza, there is also enjambment, whereby one sentence will continue across two lines. For example, the first line, "When we two parted," continues on to the second line with "In silence and tears." The enjambment here creates a pause between the two clauses, and the pause suggests perhaps a sigh. It is as if the speaker is reluctant to remember the "silence and tears" which marked his parting from his lover.
In the second stanza, Byron continues with the motif of coldness. He refers to the "dew of the morning" and the "chill on (his) brow." The recurring motif of coldness...
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