I also would suggest, "Not any longer". That ties it all up for them without giving more information than they deserve to have. These are your students after all, not friends.
T19 M15 S19 XH47 M43 bomb12/4/07 PA5/07 S12/26/07 D final 11/17/08 Back together with no defined R 05/2010 confused....to say the least!!!