De a de veras is a colloquial phrase, particularly common in Mexico, that means "truly" or "for real". It's a way to add strong emphasis and sincerity to a statement, much like saying "I'm not kidding" in English.
In the song, the singer laments, "¿Por qué me pagas así? Si yo te quise de a de veras" (Why do you treat me this way? When I loved you for real). This phrase powerfully conveys the depth and genuineness of his feelings, making the heartbreak he sings about feel even more profound and unjust.
Ever felt like you're just unlucky in love? Grupo Frontera and Maluma have a song for that. "POR QUÉ SERÁ" is all about that frustrating feeling when you give your heart to someone, only for them to treat it like a game. The singer literally asks, "¿Por qué será / Que cuando quiero querer, conmigo quieren jugar?" (Why is it / That when I want to love, they want to play with me?). It's a cycle of getting your hopes up only for it to end in another heartbreak, or as they put it, "Otro amor que se me rompe en pedazos" (Another love that breaks into pieces on me).
They get so tired of the pain that they wish they could just turn off their feelings with a button. The song even starts with the brutal wish to go back in time to the day they met their ex, just so they could decide not to show up. It's a classic heartbreak song that feels like you're destined for failure, summed up perfectly in the line, "Yo nací pa' querer a la que no me quiere" (I was born to love the one who doesn't love me). It’s a sad but powerful idea that many people can relate to when love goes wrong.