This song, "Por Mi Voluntad" by Los Pescadores del Rio Conchos, is a really heartfelt goodbye. The singer is saying a sad farewell, even though what they truly want is to stay. They know that moving on means not finding what they're looking for, and the reason to continue might be that the other person just isn't right for them. It's tough, but they realize the other person isn't happy either.
It's a powerful moment of vulnerability where the singer says, "hoy que para siempre me he desnudado por mi voz" [today I have bared my soul forever through my voice]. They wish the other person the best in life and hope they find happiness. The singer plans to try and forget the time they spent together, even though it breaks their heart and hurts to accept that it's over. They repeat that the other person isn't for them, and they won't waste time trying to achieve something that won't work, choosing to move on "por mi voluntad" [by my own will]. It's a song about a difficult but necessary goodbye, made with a lot of love and a little bit of pain.