Well, another infraction there I see. You are not allowed in whatever way to share your account with someone else, you knew that he knows your account, you should have changed it so to avoid such incidents where he uses it and commits rulebreaks. No matter which angle we look into, you really deserved the ban even if "you did not DM". For the record I am still doubtful about your story, you had a warning for DM before this.
Now I wanna know about what can you promise me if I decide to give you another chance.