Confused

I'm kinda confused now.
I don't know what is this feeling.
I just feel that she'll be a good friend.
I want her to be one of my good friend.
I'm quite sure that I haven't reach the 'like her' state.
But when I see 'YYY 寫給 XXX 的情書相當精彩，值得一看'.
I feel a bit sad and jealous.
It's just a random sentence generated from a stupid application.
I knew it's fake.
But why?
Why is this feeling coming to me?