u are correct.

A refrain is a repeated phrase or line that is used in a poem or song to create a sense of unity and to highlight a particular idea or theme. Refrains are often used to create a sense of rhythm and to draw the reader's attention to a specific message or emotion.

In "A Red, Red Rose," the refrain "And I will love thee still, my dear" is used to emphasize the speaker's enduring love for his beloved. This refrain appears in each of the three stanzas, creating a sense of unity and helping to convey the idea that the speaker's love will last forever.

The repetition of the refrain helps to draw the reader's attention to this central message of the poem, and it serves to reinforce the theme of enduring love. The refrain also helps to create a sense of rhythmic flow and structure in the poem.