Hey I know its well sad that stitch left, I cried alot aswell. Its not fair your right. Well anyway why he left... reason being guppy accidently killed a patient in the last episode of last series and stitch took the blame for him. His last scene was riding off from the hospital on his motorbike after selena died. And guppy leaves in episode 5 :( and nathan is also leaving. I hate that new consultant and that female doctor. Really hope stitch comes back to casualty one day :D