Should I be best f with her?

I haven't a lot of friends
but I have a best f,I think her characterstic and my characteristic is different
I don't know I play with her is only want to have a best friend or I really want to play with her.......
She always make me angry but I forgive her,because if I don't forgive her,I will not have best f.
Now she doesn't care me and go to a group which to make a Geography project
I am angry that she doesn't care me,

So,what should I do?