Sospechabas comes from the verb sospechar, meaning 'to suspect'. It's an interesting word because it implies a hidden truth or a feeling that someone already knew something, even if it wasn't explicitly stated.
In the song, the lyrics say, "Tal vez ya lo sospechabas" (Perhaps you already suspected it). This line adds a layer of intimacy and shared understanding, suggesting that the strong feelings between the two people were not a complete surprise, but rather something that was felt and known intuitively by both.
This song is basically a sweet, slightly nervous love confession. The singer is talking to someone who makes him smile without trying: “Si me ves que estoy sonriendo cuando tú me miras” [If you see me smiling when you look at me], and he admits his hands even start to sweat when that person is close. It’s not just attraction; he feels something growing “here in my chest,” and it’s so strong that he calls late at night and at dawn just to be near them, even “aunque no hagamos nada” [even if we don’t do anything].
The chorus is where he stops hiding it. He says “Por obvias razones cambiaste mi vida” [For obvious reasons you changed my life] and “No puedo haber caído en un mejor lugar” [I couldn’t have landed in a better place]. He blames them, in a playful way, for all the emotion they’ve brought into his heart: “Tú tienes la culpa de tanta emoción” [You are to blame for so much emotion]. He dreams every day of being in their arms and fantasizes about hugging them for real, and he’s pretty sure they feel the same: “Presiento que sientes igual” [I have a feeling you feel the same]. It’s a romantic norteño love song about that moment when you finally admit, out loud, that this person has completely changed your world.