What is This Feeling?

Every time I\'m not near you,
I have this feeling

I think about the past
The friendship we lost
It went away so fast
I hope it was worth the cost

One mistake,
Lost us our friendship
A year was our undoing

We were so close
I trusted you most
Now I can\'t handle the smallest does
Of you, even when you\'re the host

So what is this feeling?
I miss you when we are apart
But when we are together,
I feel like a forgotten dart.