(without an accent) is not "I don't know" (which is No sé ).
The core refrain, "Tu recuerdo no se va" (Your memory doesn't leave), emphasizes that despite the physical absence of a partner, their presence lingers. No Se Va txt
Learners of Spanish often analyze the title due to the complexity of the word "se". (without an accent) is not "I don't know" (which is No sé )