Anhelo is a beautiful, poetic verb that means 'to long for' or 'to yearn for'. It expresses a much deeper and more intense feeling than the common verbs 'querer' (to want) or 'desear' (to wish/desire).
In this song, the singer expresses his profound affection by saying, "Eres lo que yo anhelo" (You are what I long for). He's not just saying he wants her; he's conveying that she is the object of his deepest yearning. This single word elevates the entire sentiment of the line, making it incredibly romantic and heartfelt.
If you have ever felt your chest thumping the second someone cute looks your way, you will immediately get "Cuando Tú Me Miras" by Mexican-American group Eslabón Armado. The singer is totally head-over-heels, kicking things off with "Cuando tú me miras mi corazón palpita" ("When you look at me my heart beats") and staring endlessly at her "linda carita" ("pretty little face"). He compares her shining eyes to pearls ("tal como perlas") and flat-out thanks her just for showing up: "Gracias por entrar a mi vida" ("Thank you for entering my life"). It is sweet, clumsy, and dizzy in love.
He also keeps things very real by admitting he is not flawless—"No soy el más perfecto" ("I am not the most perfect")—and confesses to feeling petty jealousy whenever other people stare at her: "Te miran y me encelo" ("They look at you and I get jealous"). Here, you will spot the colloquial phrase "no voy a regarla" ("I'm not going to mess it up"). In Mexican Spanish, "regarla" literally means "to water it" or spill something, but in everyday speech, it translates to "blowing your chance" or screwing up. He knows he has an incredible girl on his hands, so he promises to give 110% instead of dropping the ball.