Mal de amores literally means "illness of loves" and is the classic Spanish way to say lovesickness, the heartache of losing someone.
Christian Nodal ends his plea with "Solo vuelve, que no aguanto el mal de amores" (Just come back, I can not stand this lovesickness), treating the breakup like a real sickness only she can cure. The plural amores makes it an idiom you will hear across Mexican regional music and rancheras.
Christian Nodal’s “Perdóname” (“Forgive me”) is a desperate apology from someone who knows he has damaged a relationship. He calls even though he admits, “Yo sé que no debo de estar llamando otra vez” [I know I shouldn’t be calling again]. He has been drinking, admits he did not think things through, and fears that his former partner no longer wants to see him. The repeated line “La situación está matándome” [This situation is killing me] shows how unbearable the breakup feels to him.
The apology becomes more personal when he says, “Deja de actuar como que ya no me conoces” [Stop acting as if you don’t know me]. He reminds this person that they shared “más de mil noches” [more than a thousand nights] in bed, then admits, “Me arrepiento y me avergüenzan mis errores” [I regret my mistakes, and my mistakes embarrass me]. His final request, “Solo vuelve, que no aguanto el mal de amores” [Just come back, because I can’t stand this heartbreak], uses mal de amores, a Spanish expression for the pain of love and a breakup. It is an emotional, slightly messy phone call in song form, with one wish repeated again and again: “Perdóname” [Forgive me].