Why does ACF leave chat without saying bye?

WHY?! WHY?! WHHHHHHHHHHHHHYYYYYYYYYYYYYYY?!?

I'll tell you.

Reasons...yay-ish
Well....There you go.
 * My brother wants the computer, and sometimes I have to get off it...NOW!
 * I close the window out by accident.
 * I sometimes forget that the chat window is open, and close it out when I close out the other windows.
 * I have dinner/stuff/WHATEVER, and I can't say bye