Halve

One of us will have to walk away
And I can tell you it will not be me.
I have sufficient perspicacity
To see that it must happen, but today
I'm just not strong enough; there is no way
That I can do it. It will have to be
You who leaves. I'm begging you to flee
And if you don't, I don't know what to say.
I am too weak to tell you anymore;
You know the reason, somewhere in your heart.
And knowing it, should realize, therefore
The urgency with which we two must part.
So since I cannot go, you have to start
Please tell me what you're still standing here for.