Meaning of The Perfect Friend [poem] by Shannen Wrass?

Question

Please read the poem below (:

I'm supposed to analyze this poem for school, but I dont really get it... why does the poet say in the end that "this perfect friend I found was nothing but a mirror"?

And the use of the word NOTHING BUT seems to me that the perfect friend wasn't... very important or something like that. Why?

THE PERFECT FRIEND by Shannen Wrass

Today I found a friend

who knew everything I felt

she knew my weakness

and the problems I've been dealt.

She understood my wonders

and listened to my dreams,

she listened to how I felt about life and love

and knew what it all means.

Not once did she interrupt me

or tell me I was wrong

she understood what I was going through

and promised she'd stay long.

I reached out to this friend,

to show her that I care

to pull her close and let her know

how much I need her there.

I went to hold her hand

to pull her a bit nearer

and I realized this perfect friend I found

was nothing but a mirror.

Answer 1

This means that it was herselff,

Shes basically saying that no one could help her with her problems EXCEPT herselff,

and that no one else really understood herr.

i likeee ittt.

Hopee i helpedd hun =]

Answer 2

Its about herself. She is looking at her reflection and she now understands that the best person to be acquainted with is yourself.