Well, even though his "test" was not very nice, that isn't enough to assume NPD. You don't really know his history, he could have very well gotten involved with a very needy type girl that played a lot of head games with him and that is a part of what he wants to avoid. Actually, I just noticed at the end that he had that test because of his ex-girlfriend. So, this is to avoid whatever she did that hurt him somehow or he felt stressed/trapped by.

Every person you meet is a "lesson", remember that. Learn something from this individual, there is some meat on the bone for that one. Also don't break up with someone when you really don't want to and just want more "attention". Don't ask a bf to help you with your family problems either. You had not known him long enough to depend on him that way either and most males don't like to get involved with that, especially not young men like he is. This particular guy is not looking for anything "needy", he wants a girl that is independent minded and can stand on her own. Given the short time of that relationship, I think that you should have kept quiet about noticing him on that dating site too. You could have seen that and held your cards on that one, just decide to be observant for a while longer. His test there was to see how you would need to know more about him and begin to track him. He wants a girl that is busy enough and confident enough about herself that she won't be checking. Him deciding to not call you constantly, well, if you were more independent as he wanted, you would be busy and not suddenly get all upset like that. Him not wanting you to date others? How long before he said that? A week or two? Maybe you could have not "just" given in to that so easily, show him how quickly he could own you that way. He wanted someone stronger and more independent to say, "hmmm, that is inviting but I would rather take more time with that one". Also, you spent too much time on him at first too, he got you rather quickly there too, no other things you need to be busy with, just waiting for him?
He is only 21, and independent as you mentioned, ivy league?, well, he is in no rush to commit to anyone, he's got lots of time.

Learn something from this one. It's not all about you, remember that. He wants a fish that is going to be not such an easy catch and just hang on him. Think about this test when the next one comes along.