you and Noodle were on the M. Harriet, on the road to the Plastic Beach, she's being a bit distant, just thinking about what she'll do when she gets in there, while you're just looking at her, a bit worried, but then, she finally says something

Noodle: "So... Why are you helping me?"

(sorry if it's not accurate, I just learned Gorillaz lore, like, TODAY)