I slept with your ex. The one you're still hurt...

I slept with your ex. The one you're still hurt over. The one you warned me about. Happened multiple times. Over months. Behind your back. In your house. You introduced us. Trusted us. Never suspected anything. When they started dating someone new, I was relieved. Not guilty. Relieved. You'll never know. But I'll always know. And it will always be between us.