Yes. You definitely have a problem. I don’t know enough to call it Stockholm Syndrome. But you did share enough for me to be deeply concerned about you.
This is a very, very dangerous situation. This guy is manipulating you and stalking you. Further, I don’t know what you mean when you say you found him his “favorite girls”. If you helped him hurt kids, you are even more deeply troubled than you believe. That is criminal behavior.
I suspect something happened to you in the past that has made you vulnerable to this guy. That doesn’t make your thoughts and behavior okay. A reason is not an excuse. But it is a place to start for working on your own healing.
I’m very glad you wrote. It indicates to me that you are at least questioning your thinking. Please, please follow through and make an appointment with a mental health counselor to sort this out. If you don’t get some professional help, you are vulnerable to being terribly hurt yourself and, under this guy’s influence, you might help him hurt others. That would ruin other people’s lives as well as yours.
I wish you well.