Desarma literally means "disarms" or "takes apart." It's a strong verb that you might not expect in a romantic context.
In this song, Carlos Baute uses it metaphorically to describe the overwhelming power of love. He sings, "Cuando el amor te llega, te atrapa y te desarma" (When love arrives, it traps you and disarms you), implying that love completely breaks down your defenses and leaves you vulnerable, in the best possible way. This vivid imagery makes it a captivating word.
Carlos Baute's "Amarte Bien" is such a sweet song about being completely head-over-heels in love! He starts by wondering how he can even express such a huge feeling in just a few minutes: "Como te amo yo, Como te explico, Como resumo en poco tiempo, Lo que te amo yo" [How I love you, How do I explain it, How do I summarize in a short time, How much I love you].
He remembers the exact moment he met this person, an unforgettable autumn evening, and how he'd been looking for them for a long time without realizing how easy it would be to give them his soul. The chorus is all about wanting to love them well: "Amarte bien, Amarte bien, Lo único que quiero es solamente amarte bien" [To love you well, To love you well, The only thing I want is just to love you well]. He describes this love as "magia" [magic] and "fantasía pura" [pure fantasy] since their first kiss. He loves them "en carne viva y sin dolor" [in the flesh and without pain] and "como un niño cuando tiene una ilusión" [like a child when they have a dream]. It's a truly passionate and devoted declaration of love!