Acuses comes from the verb acusar, meaning "to accuse". It's used here in the powerful plea, "No me acuses por favor" (Don't accuse me, please).
This single word is packed with drama and guilt. The singer is ending a relationship he still loves due to his "obligaciones" (obligations), and he's begging his lover not to blame him for the heartbreak. It captures the core conflict of the song: a painful decision made out of necessity, not a lack of love.
This song is a total heartbreaker. Carin Leon sets up a dramatic final meeting to end a relationship. He starts by telling his lover, "Este es el día más triste de mi vida" (This is the saddest day of my life), which is a pretty intense way to begin a conversation! He explains that they can't see each other anymore because of his "obligaciones" (obligations) and the fact that they've had to hide their love, "el tenernos que esconder" (having to hide).
Even though he's the one ending things, he's clearly in a lot of pain. He promises, "No te dejaré de amar" (I won't stop loving you), but insists that they must part ways forever for their own good. His final request is simple and devastating. He asks her not to cry and to just give him one last moment: "Dame un beso y dime adiós" (Give me a kiss and tell me goodbye).