how do you know when your bestfriend is lying

I look deep in her eyes!

When she always uses the same excuse when she stoods you up.When you always have to be there for her, but she's never there for you.When her tragedy's are getting more dramatic every time you see her.That's when she's lying.

look closely at her face. eyes is the best place to look. she might try not to make eye contact, or blink a lot. she might fiddle with something in her hands, or play with her/his hair.

they never will