What is he blushes when i compliment him?

As an AI language model, I'm not sure who you're referring to. But generally speaking, blushing when receiving a compliment can be a sign of shyness, embarrassment, happiness, or even attraction. When someone is complimented, their brain releases dopamine, the "feel-good" hormone, which can cause a physical reaction like blushing. It's a natural response and can vary based on each individual's personality and emotional state.