The change in me

I think that working life has made me more skeptical of people.

In the past, I was convinced that no matter how "atrocious" a person was, there must be something good in him/her. I even advised my friend(s) that always look at the strengths of your friends, and this will make the weaknesses lesser and more acceptable.

Nowadays, somehow seeing the people around me (not all though), I will always jump to the negative side of the person in question, and convincing myself the person is not that bad is not that easy anymore.

And I complain a lot more now.

Have I changed? Or is reality biting at me? Or is my faith is not strong enough? Am I getting really selfish?