[Vocabulary] what does that mean ?

[M!do]

If our love was a fairytale
I would charge in and rescue you
On a yacht baby we would sail
To an island where we’d say I do

And if we had babies they would look like you
It’d be so beautiful if that came true
You don’t even know how very special you are

Chorus

You leave me breathless
You’re everything good in my life
You leave me breathless
I still can’t believe that you’re mine
You just walked out of one of my dreams
So beautiful you’re leaving me
Breathless


Hi

Please Can you clarify the meanings of the bold words.

1-what do those words mean exactly in that context ??
2-Can I put "never" instead of "even" ? why ?


thank you
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[M!do]

I got it,:up:

thank you so much,

but what's the difference between "I don't even know \ I don't ever know" ?