La neta is popular Mexican slang that means "the truth" or "for real". It's a casual and cool way to emphasize that what you're saying is genuine, similar to saying "I'm being real with you" in English.
In the song, the singer says, "Mi amor te digo la neta" (My love, I'm telling you the truth), using this slang to make his confession feel more authentic and straight from the heart. It's a perfect example of how learning slang can add a unique local flavor to your Spanish!
Emmanuel Cortés and Santa Fe Klan come straight to the point in "AMOR [Remix]": they are completely smitten, borderline obsessed, and not trying to hide it at all. The track rolls out like an open-hearted romantic confession, kicking off with the sweet desire to take someone out ("Quiero llevarte a una cita" [I want to take you on a date]) because her smile instantly disarms him ("es lo que me debilita" [it is what weakens me]). There is zero hesitation here. Between praising her simplicity, calling her body beautiful, and admiring her eyes ("Y esos ojitos / Ni se diga más" [And those little eyes / Say no more]), Cortés makes sure she knows she is entirely perfect in his eyes.
When Santa Fe Klan jumps in, the energy stays just as head-over-heels. He admits to keeping saved photos of her, daydreaming constantly, and basically losing his mind when she is not around ("Si no te veo, me desespero" [If I don't see you, I despair]). He also throws in some everyday Mexican slang, using the phrase "la neta" in the line "Mi amor te digo la neta" [My love, I'm telling you the truth]. La neta means "the truth" or "the real deal," giving his claim of being totally hooked on her kisses ("adicto a tus besos") a punchy, casual sincerity. It is a straightforward, sweet Norteño serenade built on pure devotion and zero mind games.