Am I losing you?

We are sisters and we are friends,
Linked together no matter which way the road bends.
But somewhere deep inside I hurt when you're with him.

You say so many times you'll never leave,
I hope there are no lies up your sleeve.
I can't afford to be hurt again.

But I am excited that you're moving on,
Someone else that over you will fawn.
Yet I am jealous he can give you comfort.

You are attracting more loyalty then you realize,
And my heart increases a size...
I feel like shouting with joy and curling up in comtempt.

You make me happy and torture me,
I don't really know what to be...
Can I please just disappear?

But I can't because I know that'd make you sad,
I want you to be happy and not at all mad.
Is that so wrong?

Please reassure me once again,
Hold me in your arms, is that a sin?
Inside I ask "Am I losing you?"