I don't know how to tell her.
How are you expected to tell anyone?

"This isn't doing it anymore;
your affections aren't suitable for me.
I would rather have *** with
other people than you."

There's nothing wrong with her.
She treats me well,
and I spend more time with her than most.
But she isn't her. You know? Her.

"It's not that I don't like you.
It's just that most people
make me incredibly lonely.
And you're simply one of them.
No hard feelings, right?"

There's just no pretty way to say it.