I see right through your mask

When I got betrayed, I was blessed with this blessing and curse. I don't trust people easily. Well, in this case I was right. 

You came into our life acting so sweet  and kind,
You got most people fooled and they were blind, 
Blinded to your faults as you played with their minds, 
All but me, because my previous hurt came to mind.

You had them fooled but I was not to be played, 
Not this time will I be betrayed, 
True enough your true colours exploded like a grenade, 
All those who were fooled were hurt and dismayed.

But I watched  and knew this was to be expected , 
So while most of them felt dejected, 
I held my head and was not affected,
You were exactly like I suspected. 

Most people liked this person but I just could not trust her. I had a really good teacher before her and I knew no one could replace this teacher. So, at first it was because of my loss. But soon, I begun to realize , I had lost another of my favourite teacher. So what was the problem ?Then it hit me like a ton of bricks. I was hurt by a sweet and nice teacher once. I willed myself not to trust another living soul expect my mother , father and occasionally my sister. But , sometimes I would not trust them. I have another deep and dark secret about why I do not trust people but that is too private to be shared. 
While most people got comfy with her, I stayed away. Then one day, she showed her true colours to some of my friends and I. From that moment on I knew she spelled trouble with a capital T. A year later, most students begun to hate her.  She back stabbed us and changed the story to fit her. Most people were hurt but I , I knew this was comming.