Meeka's poem is about how unpredictable a close friendship can feel. The speaker swings between two extremes. On good days, she can tell her friend anything without shame, and talking to them feels like a hug or someone wiping away tears. It's the two of them against the world, and the cold fades.
On bad days, the feeling flips. She worries she's a nuisance, hesitates to ask even simple questions, and feels she's competing with the world for her friend's attention. Loneliness hits so hard she describes freezing to the bone. The address "my love" suggests deep affection, even if the poem frames it as friendship.
The mood is tender but anxious, with a note of weary acceptance. Short, rhyming couplets give it a light, almost sing-song rhythm, which contrasts with the heavy emotions underneath. The ending, "that's all I'll say," shrugs it all off, though the shrug may hide how much the speaker still hurts. The rollercoaster of the title says it well: thrilling, scary, and impossible to get off.