Why does Effy never shows her feelings? What is she scared of?

it's not try that she never shows her feelings! you can see that in episode 8 in season 3! she hides her feelings because she is scared of being hurt!

bec she hasn't ever felt this feeling love....she's scared...she can't stand it...and she couldn't tell this someone....
In 3x10 Anthea said: I do know her. And I know that she has got so much amor in her heart. But the thought of letting it out, showing her cards, scares her to death.