Hey, I'm by no means a manifesting expert. I'm a novice too but I think maybe you should ask yourself why you want this relationship with this person. If you're thinking that he is really not for you is that because you don't really like him or is it that you believe that what you are destined for is outside of your control?
I also want to manifest an SP and yes, I do adore him but there's a huge part of me that wants him to validate me. His rejection hurt my ego. In other words, I needed him to accept me so that I feel like I had value. It took me awhile to admit that cause again--my ego. So now, I am trying to focus more on my self-image and my self-esteem and to realize that I can have anything I want cause I am just that amazing. -_-;
So, do you want him because you want him or do you want him because you think it will make you feel a certain way about yourself?
The universe doesn't test you. Nor should you try harder. If you try harder, it will just get harder. I think what seems like a test, is actually just allowing it. I know I do this too. So it feels a lot like the pot calling the kettle black (I think that's how the saying goes).
I hope I'm helping and not stepping out of my lane here