if she is my friend ,i will tell her what made me sad,but if i don't like her ,i will smile and ignore her.

 If you have someone really understands u. That you should pour your heart rubbish to him or her. Because friendship is the best cure to spiritual illness

I think we should always express our feelings in a proper mature way, sometimes it's not about what you say but HOW you say it. 

I will tell him you made me sad by doing this. I wanted to see more of this friendship.  . Now how can I make myself happy? 

Try this.