Trust

You can love or hate someone/anyone very easily but can't trust very easily because loving or hating someone is a natural thing. Or inbuilt quality 

But can't Trust Someone Very Easily 

Because Trust Comes With Company/Experience 

Trust Is Like A Foundation

And Is A Foundation Itself In Any Relationship

Whether Brother-Sister, Boyfriend-Girlfriend, Husband-Wife, Friendship etc

It Takes Millions Of Years To Built A Trust

But Fraction Of Seconds To Break That Same Trust