why?

I don't know why?
I'm hurting seeing you with her,
I thought that was nothing,
but, I was wrong,
that was my jealousy,
I don't know why?
you always show me that you want me,
oh! Maybe it just me,
playing with my own shadow,
but now, it was dark,
no more shadow to be seen,
It's kinda funny,
when I cried because a man,
Cause I've said ,
no man, no cry,
but now, my tears falls
because of losing you,
I don't know why?
My heart broke into thousand pieces,
When I heard ,
You two are in love
Now I know,
maybe it's my mistake ,
I'm living too long in my fantasies dream,
who am I to be with you,
I'm just an ugly , fat girl
that live in the biggest fantasies worl.