Regulus clears his throat, "It’s my fault." And he seems to realize that it doesn’t explain anything and he continues, "Mother and father forced me to take the mark while we were back in school. I didn’t want to tell anyone but last year I had discovered that the Dark Lord had created six horcruxes, meaning that even with the war no one could kill him. I was planning ways to find them and destroy them since the day I figured it out.Then I let it slip to James by accident and he refused to let me do this alone, telling me that if I died without him knowing it would destroy him."