Bastará is the future tense of the verb bastar, meaning "to be enough" or "to suffice." It's a word that carries a sense of finality and resignation.
In the context of the song, the singer uses it with a touch of bitterness, saying, "Bastará jugar con mis sentimientos" (It will be enough to play with my feelings). This implies that the emotional games are reaching a breaking point, and the singer has had enough, making it a poignant and memorable word.
This song, "A Decirme Que" by El Arrebato featuring El Golpe, is a really direct and emotional plea from someone who feels completely strung along in a relationship. The singer is begging their partner not to tell them they don't want to be with them anymore, especially when they're right there in their arms. It's like they're saying, "How can you even think of leaving when I feel so much for you?"
The lyrics are pretty blunt about the pain: "dame una razón para seguir viviendo" [give me a reason to keep living] and "tienes otro amor" [you have another love] really hit hard. The singer is fed up with being played, repeating "basta de jugar con mis sentimientos" [stop playing with my feelings] and "basta de jugar con mi corazón" [stop playing with my heart]. It's a powerful message of heartbreak and frustration, asking for honesty and an end to the emotional games.