Bondad translates to "goodness" or "kindness". It's an interesting choice in this song because it's used ironically.
The singer is reflecting on a past relationship where his partner's "goodness" (or perhaps naiveté) led her to believe he wouldn't be hurt. Now, the tables have turned, and he's reminding her of her past words, highlighting the shift in power dynamics. This ironic usage makes the word stand out.
Have you ever been in a relationship where you thought you'd never get over someone, only for them to come crawling back later? That's exactly what El Komander is singing about in "El Papel Cambio (En Vivo)"! This song is all about a dramatic role reversal.
He starts by calling out his ex, saying, "y que te imaginaste que si te ibas a acababas con mi vida" [and what did you imagine, that if you left you'd end my life?]. She thought he'd be lost without her, but surprise! He's moved on and found someone new, someone he loves. Now, she's the one begging him to come back, even "de rodillas" [on her knees]. But he's not having it, reminding her, "el papel cambio" [the roles changed]. It's a blunt and satisfying take on getting the last laugh after a breakup!