Maldigo comes from the verb maldecir, meaning "to curse" or "to damn". It's a strong and emotionally charged word that conveys deep regret and anger.
In the song, the singer uses maldigo to express his profound sorrow and bitterness over the goodbye (aquel adiós) that separated him from his love. He sings, "Y que maldigo a diario aquel adiós," showing how he daily curses the moment they parted, highlighting his inability to move on and the pain he still feels.
Have you ever run into an ex and had to pretend everything was fine, even though your heart was breaking? That's exactly what's happening in Pesado's "Que Aún Te Amo" (That I Still Love You).
The singer is totally caught off guard when he sees his ex again. He even feels her hand in his, but this time, it's different – she's with someone new! She's happy, smiling, and acts like their past is ancient history. He has to lie, inventing a new girlfriend and faking happiness just to get through the moment. He's literally "mordía los labios y el alma por no poderte decir" (biting his lips and soul for not being able to tell you) that he still loves her. He misses her like crazy and wishes he could just wake up from this nightmare. It's a really sad song about the pain of seeing an ex move on when you're still completely in love with them.