"
Bakit ba ganyan, binata'y di alam
Na ang ewan ay katulad na rin ng oong inaasam
Unlike the rest of the song, this part (judging from the word 'binata' meaning young man) is from the object of affection's perspective. She is lamenting the fact that he is not aware of the meaning behind her ''I don't know'' answer is actually ''YES'' she's just too shy to say it outright.
This is a typical picture of an old fashioned courtship among young Filipinos, where the young man is unsure, and the young lady is rather modest.