Me vs Myself

I'm a cruel and revengeful person. I can do tenfold (even hundredfold) crueler than what you did to me.
I can be a totally different person from what you see me daily. Double personality? Perhaps, I dunno. And I don't care what it's called.

My personality is the root of my complication these last two days.

For me, the cruelest thing ever takes place in the world is indifference. O yeah, war is cruel and hatred can trigger killing. But, in war and hatred you still think of your enemy. While indifference is not.

Let me give you an example of indifference. Let's say there are 3 boys (ABC) involved in a fighting. It was because A looked for a trouble, he started it first. Then accidentally, A and B fell because they were tripped. A was hurt, B wasn't. Now, A is a smart student and belongs to the top class. B isn't smart and belongs to 'garbage' class. B is blamed and must be punished.

You are B's friend and you saw how it happened. B asks you to defend him. If you are indifference, you'll say no. Now, it's cruel, isn't it? Considering you are B's friend.

I know what must do, but I'm struggling with myself.
Here it is: LOVE vs INDIFFERENCE or FORGIVENESS vs INDIFFERENCE.
I want to do the right thing, but then I'm against myself. And it's hard to knock off my cruel-and-revengeful self these last two days.