I interpret this as the singer being the exgirlfriend of a man in a relationship and her fear that he is still in love with his current girlfriend. She will not tell the girlfriend because then the man will be upset and she will be out of the picture, but she hopes the girlfriend finds out so she can have him to herself.
I interpret this as the singer being the exgirlfriend of a man in a relationship and her fear that he is still in love with his current girlfriend. She will not tell the girlfriend because then the man will be upset and she will be out of the picture, but she hopes the girlfriend finds out so she can have him to herself.