The song "They Don't Know" by JR Castro is about a man who has a past filled with mistakes and bad decisions. He is afraid that his new love interest will judge him based on what others have said about him. He admits that he used to play games with girls and that they didn't last, but he wants her to know that she is the only one who matters now. He asks her if she thinks of him when he's not around and tries to assure her that he has changed. The chorus of the song emphasizes that they should not listen to what other people say about them because they don't know the truth. He wants her to put the jealousy out of her mind and trust in their love. He acknowledges that it will take a lot of trust from her in order for them to make it through. The song continues with the man reassuring his love interest that he has changed and that he loves her. He responds to rumors that she may have heard about him being selfish and wanting to have his cake and eat it too. He tells her that he has learned to love and that she has shown him how. In summary, "They Don't Know" is a song about overcoming past mistakes and learning to trust in new love. It encourages listeners to ignore rumors and judgments from others and to focus on the truth of their own relationships.