Rinché is a fascinating word that likely comes from a regional or colloquial variation of "berrinche," which means a tantrum or a childish fit of anger.
In the song, the lyric "Ya no me cela ni me hace me rinché ya no" suggests that the person is no longer getting jealous or throwing tantrums. This word is interesting because it's not a standard dictionary term, making it unique and indicative of a more informal or specific dialect, which adds a layer of authenticity to the lyrics.
Julian Mercado's "Como Te Olvido (En Vivo)" is a heartfelt cry from someone struggling to move on after a breakup. He's clearly hurting, noticing all the ways his ex has changed since they broke up. She doesn't get jealous anymore, she doesn't call him at night to chat, and she doesn't even ask their friends about him. He laments, "ya no me cela ni me hace me rinché ya no me llama en las noches para platicar" [she no longer gets jealous or throws tantrums, she no longer calls me at night to chat].
The singer is completely lost without her, asking, "cómo te olvido si fuiste mi vida" [how do I forget you if you were my life] and "cómo te olvido si eres mi aire" [how do I forget you if you are my air]. He can't imagine life without her, feeling her presence in every heartbeat: "sin cada latido Estás presente" [without every heartbeat, you are present]. He even dreams of a future where he'd love her "hasta que muera y si se puede en la otra vida Te seguiría amando igual" [until I die, and if possible, in the next life, I would continue loving you the same]. It's a powerful and emotional look at the pain of lost love and the struggle to let go.