About My Best Friends Feeling

I don't know why

When I'm with you, I feel so much comfort
I always want to stay with you,
Sharing our story, Just spend our time together

When I see your face, I feel relieve
Just to hear your voice, it makes me calm

What kind of feeling is this?
I don't know.

When we are apart, I feel lonely
When I can't meet you, I feel empty

Seeing you everyday is a great pleasure for me
You can make me laugh when I'm sad
You can cheer me up when I'm down

For the first time, I think of you as brother I never have
And you think of me as your sister

I think this feeling is growing bigger and bigger
I don't want to lose you
I don't know what your feeling to me

Do you feel the same?