BLANDO Pt.2 is Marc Segui admitting that love has turned him to mush. The key word is blando (soft), and "Me tienes hecho un blando" means "you've turned me into a softie". He even spells it out letter by letter, B-L-A-N-D-O, like a guy who can't believe it himself.
The lines are sweet and a little cheeky. "Si te vas un segundo y ya te extraño" (if you leave for a second, I already miss you). People ask him "qué fumo" (what I'm smoking) because he's always happy. She's not number five, four, three or two: "tú eres la uno" (you're number one). And there's a fun crime joke: "Me robaste, ahora te busca la poli" (you robbed me, now the cops are after you), with poli as casual Spanish for police. My favourite is "Estoy callao' pero mis ojos te lo gritan" (I'm quiet, but my eyes scream it at you), where callao' is the spoken way of saying callado.