Encabrona is a strong, informal verb derived from "cabrón," which can mean "goat" but is often used as a vulgar term for a "bastard" or "asshole." Therefore, encabronarse means "to get really angry" or "to get pissed off."
In the song, the artist uses it to express intense frustration and anger when he sees his former lover being flirtatious with other people, singing "me encabrona porque con otros tú te pones coquetas" (it pisses me off because with others you get flirty). It's a raw and emotionally charged word that captures the depth of his jealousy and resentment.
Yahir's "Aveces" is a raw and honest look at the lingering pain of a past relationship. He's struggling with the absence of someone he deeply misses, even admitting, "a veces siento que no tengo esa mi sufrimiento" [sometimes I feel like I don't have that suffering of mine], suggesting he's almost used to the pain.
He talks about trying to move on, saying "trato con mujeres pero ninguno me lo hacer con motor" [I try with women but none of them make me feel it with engine], meaning no one else can ignite that spark. He's haunted by memories, like her fights and her attitude, and he's frustrated when he sees her being flirty with others. Despite the hurt, he still wants her back, even asking her to call him when she feels alone. It's a really relatable song about being stuck on someone, even when you know it might not be good for you.