Aposté is the past tense of the verb apostar, which means "to bet" or "to wager". It's a fantastic word for expressing that you've taken a risk on something.
In the song, the singer uses this to create a powerful metaphor about a failed relationship. He sings, "Aposté cruz y habían dos caras" (I bet tails, and there were two heads), describing a rigged coin toss. This clever line perfectly captures his feeling of being in a no-win situation, having gambled on a love that was destined to fail.
This song is the ultimate breakup anthem for when you've finally realized you weren't the problem. The Colombian band Morat teams up with Argentine rapper Duki to tell the story of a relationship that's impossible to win. The singer is done with the games. His partner asks him to leave, but when he does, she starts a fight to make him stay. He's heard all her excuses before, like "que quien te ama te hace sufrir" (that whoever loves you makes you suffer), and he's not buying it anymore. He lays it all out with the incredibly direct line, "No te mientas, el problema eres tú" (Don't lie to yourself, the problem is you).
What makes this song so good is how specific it gets. He accuses her, "Me pides flores y las quemas" (You ask me for flowers and you burn them), perfectly describing her self-sabotaging behavior. Duki's verse adds a modern, almost funny twist to the heartbreak, lamenting that they "hubiéramos iluminado París como Messi" (could have lit up Paris like Messi), showing just how much potential he thought they had. It's a song about finally seeing a toxic situation clearly and placing the blame exactly where it belongs.