Cora is a popular slang term for corazón, which means "heart". It's a casual, modern abbreviation you'll frequently hear in contemporary Latin music, especially in Reggaeton and Regional Mexican genres.
In the song, Junior H gives a warning, singing, "Te puedo dejar el cora roto" (I can leave your heart broken). Using cora instead of the full word corazón gives the line a cooler, more informal feel. Learning slang like this is a perfect way to sound more like a native speaker.
Junior H isn't trying to trick anyone in "ENTRE NOSOTROS". This song is a very direct warning to a woman he's interested in. He's attracted to her, calling her a "princesita" [little princess] from afar who turns into a "diabla que me domina" [devil that dominates me] in private. The whole vibe is about a temporary, intense connection fueled by a couple of drinks and a full moon.
He lays all his cards on the table, telling her straight up, "Nada serio, pues soy peligroso" (Nothing serious, because I'm dangerous). He's not just talking about a little heartbreak; he warns that he's involved in a risky lifestyle where "me sigue la policía" [the police are following me]. His final message is blunt: if she develops feelings, it's on her. He makes it clear that "Si te enamoras, no fue culpa mía" (If you fall in love, it wasn't my fault) and she could end up "dañada de por vida" [damaged for life].