was leaving, used to leave
Если придет Мария Николаевна, скажи, чтобы она не уходила.
If Maria Nikolaevna comes, tell her not to leave.
— Зеркало (1975)
I didn't want you to leave.
Tell her to go away.
Она забыла запереть дверь, когда уходила.
She forgot to lock the door when she left.
I don't want you to leave.
Вы пришли как раз в тот момент, когда я уходила.
You arrived just as I was leaving.