Pretendientes translates to "suitors" or "claimants." It's a less common word in everyday Spanish, adding a touch of formality and drama to the lyrics.
In the song, the singer uses it to refer to other people who might be interested in the person he loves, emphasizing his own devotion by stating he loves her more than any of her other "pretendientes." This word choice highlights the romantic rivalry and the depth of his feelings.
Zacarias Ferreira's "Cuando Se Trata De Amores" is a passionate plea from someone deeply in love, trying to convince their beloved to give them a chance. He's frustrated because he knows he feels something strong, saying, "Porque te digo que no si yo sé que Siento" [Why do I tell you no if I know that I feel it]. He even admits he 'dies' when she says she doesn't want him near.
He's so confident in his love that he challenges her, saying, "No creo que conozcas a alguien tan enamorado" [I don't think you know anyone so in love]. He believes he's the most devoted of all her admirers, even if he's not perfect. He's worried she'll reject him with an excuse like "bĂşscate otro porque no este no funciona" [find someone else because this one doesn't work], but he insists that "es muy difĂcil entender razones cuando se trata de amores" [it's very difficult to understand reasons when it comes to love]. He just wants her to acknowledge his feelings and give their love a shot.