Being Alone And Depressed

It can be hard to say goodbye, because you know that you will be going back to being alone. Especially when you are very close to someone, or when you are very lonely. Saying goodbye can be difficult because you are (rightly) not interested in being alone. It can cause a very hard down after a very pleasant and long-lasting high. So how do you say goodbye? How do you part when you know that parting is not