Sufrido literally means "suffered" or "long-suffering." It's an interesting word choice because it's used as a noun to describe a person who has endured hardship or pain.
In the context of the song, Rels B uses "Sufrido" to refer to himself before he found his partner, implying he was a lonely or struggling individual. He also uses it to describe those who envy his current happiness, suggesting they are "suffering" from jealousy. This dual usage makes it a unique and memorable word.
Rels B teams up with Los Sufridos for "LA PROPUESTA," a song all about a guy who's completely smitten and ready to commit! He starts by telling his love, "Estaba en malos coro' y por ti yo me quité" [I was in bad crowds and for you I quit], showing how much she's changed him for the better. He's so dedicated that he says, "Pa' lo que tú me digas es que estoy" [For whatever you tell me, I'm here].
The big idea of the song is right there in the title: "Podría hacerte una propuesta, Pasar toda una vida a tu lado, mi amor" [I could make you a proposal, To spend a whole life by your side, my love]. He's not about making empty promises, though, admitting, "Pudiera hacerte mil promesa', Venderte pila de sueños pero ese no soy yo" [I could make you a thousand promises, Sell you a bunch of dreams but that's not me]. Instead, he's focused on the undeniable truth that "Es inevitable quererte como te quiero yo" [It's inevitable to love you the way I love you]. He even addresses the haters, saying, "Se mueren de envidia por la noche si nos ven" [They die of envy at night if they see us] and declaring, "somos marido y mujer" [we are husband and wife], showing how secure he feels in their relationship. He was a "sufrido" [sufferer] before her, but now his life has turned around!