Why should i let him go?

Why is it so hard to let go of somebody?
Everyone says to let him go.
But no one knows how hard that would be.
He was my only solid thing,
in a world of liquids.

The only person that was there for me,
When no one else was.
The only person,
that understood everything.
The only person that still does.

He was the only one that knew everything about me.
The only one that loved me for me.
The only one that could love me no matter what.
He told me that.
He said forever.

I have no doubt in my mind,
That he doesn't still love me.
No doubt in my mind,
That he ever stopped.
No doubt that he ever will.

I love him so much,
If only he knew.
I just wish,
That he could find the time to say,
"I love you too"