Intranquilo translates to "restless" or "uneasy." It's a more nuanced word than simply
Have you ever been completely confused after a breakup, even when it's obvious what happened? That's exactly where Banda Clave Nueva takes us in "Amor Perdido" [Lost Love]. Our singer is reeling because someone else has stolen his love, taking "Cada caricia y cada suspiro" [Every caress and every sigh]. He's picturing his ex in a beautiful dress for this new person, wondering, "En que parte se hicieron ojitos?" [Where did they make eyes at each other?] and "Yo donde estaba cuando se besaron?" [Where was I when they kissed?]. He knows it's clear what happened, but he's still so confused!
It's a really relatable feeling of denial and a bit of self-pity. He keeps going back and forth, thinking "Igual no sirve de nada investigar / Como te he perdido" [Maybe it's no use investigating / How I lost you], but then immediately wondering if she's "todo y por eso / Duermo intranquilo" [everything and that's why / I sleep restlessly]. He even considers accepting that "tus besos no son míos" [your kisses aren't mine], but then swings back to hoping "Capaz que valga la pena y pueda ser / Feliz contigo" [Maybe it's worth it and I can be / Happy with you]. It's a raw look at the messy, up-and-down emotions of losing someone you love and struggling to accept it.