Suspirar literally means "to sigh". It's a beautifully evocative word you'll often hear in romantic songs and poetry to express deep emotion.
In the lyrics, Sebastián Yatra mentions finding someone "que te haga suspirar" (who makes you sigh). This phrase describes a person who inspires such powerful feelings of love, longing, or passion that they quite literally take your breath away. It perfectly captures the tender, heartfelt emotion of this ballad.
This song is about a breakup that feels completely wrong, but also completely necessary. Sebastian Yatra starts by imagining an easier world: "Mira si la vida fuera fácil yo tendría mil amores más" (Look, if life were easy I'd have a thousand more loves). But life isn't easy, and he has to leave someone he loves. The song is full of this painful conflict, repeating the lines "Me debo ir / No me quiero ir" (I must go / I don't want to go). It's a goodbye that doesn't feel like a real goodbye, because the love is still there.
So why are they breaking up? He gives a powerful reason: "estoy seguro que dos / No sobreviven con solo un corazón" (I'm sure that two people / can't survive with only one heart). He feels they've become so close that they've lost themselves. The separation is a painful step towards individual growth, so they can both pursue their own dreams. It's a mature, but heartbreaking, look at a relationship where love alone isn't enough to make it work.