Smile doesn't represent that your happy, sometimes Smile's are Like mask to cover something.
Wearing a mask doesn't mean your Two Faced, I'm wearing a Mask to cover up my Emotions, my real self that is suffering behind my smiles.
Sometimes if a person is Emotional they either have a Good life or Bad.
Those people who express more emotions, like sadness and anger is likely more ok to trust than a person who always smiling^^
I'm not saying that you should stop trusting someone, what I'm implying is I hope that you can open up with your friends, siblings, family or any people you want to open up with.
When a Friend is hurting we must stand together because that is what friends for^^