He said good night; he meant good bye.

Waste.

Everything is a waste.

A waste of effort; he didn't care.
A waste of time; he doesn't want it.

Everything I did was like waste; unwanted, disposable.

But we are still friends.

Maybe he just didn't care; I am just one of his friends; I don't want to be friends.

Waste is unwanted; just like I am.
Waste are forgotten; just like I am.
Waste are not minded; just like I am.