Confused

You're not physically here,
No you're in me though,
You're part of me,
Right? That is right isn't it?
I get confused,
About how to be here without you,
About how to live life without you in it,
It's like trying to learn how to do everything all over again,
I miss you and wish you were here with me again,
With us again,
We might not understand why,
We might not be able to explain why you left,
And we might not be able to explain anything about it,
But we do know that we miss you,
That we want you back,
And that we are sad that you left us