"Celos" (Jealousy) is a vallenato with a very patient narrator. He has never wanted to change his partner: "por mi mente no ha pasado que para ser feliz te tengo que cambiar" (it never crossed my mind that I had to change you to be happy). The problem is her. She keeps judging him with no reason, and he names the culprit straight out: "Esos celos son los que te roban tu felicidad" (that jealousy is what robs you of your happiness).
Then the tone gets firmer. He tells her to stop and think about what she gains by acting like this, and warns her that she is losing him: "otro como yo no vuelves a conseguir" (you won't find another one like me). It's a bit of a boast, honestly, but he follows it with a soft spot: living alone is the last thing he wants. The final stretch turns the chant "Son los celos" into a spiral, jealousy that kills, wounds and hurts, until it makes him feel he'll go crazy without her love.
Words to learn: celos is always plural in Spanish when it means jealousy, so "los celos" is just "jealousy". Solito is a diminutive of solo (alone), which makes it sound even lonelier.