Dark heart!

I feel like, i am slowly creeping into darkness. My heart is getting darker and darker day by day.
I have never been this person. Very clean hearted and always helpful, without asking any thing in return.
Now, its getting harder and harder for me to forgive and forget. Getting judgemental is another thing.
I don't want to be this person and IA, I will work on my self cleasening and stay the way, I have always been.