When I was kid I taught by older people around me that everyone has his/her own fortune, and if I could not get what I want, it's means, that is not my fortune.
In my life I am not always can get what I want. It make me feel disappointed, of course. But Alhamdulillah, what taught by those older people make me able to eliminate this disappointment easily. It's because I believe, if I could not not get what I want, it's mean that is not my fortune, but In Shaa Allah, later I would get what become my fortune.
As a man, of course I have interest to woman. When I was young and unmarried, few I times I interested to a woman, but I could not get her because she was not interested to me. Then?. I could tell myself "She is not for me, she is not my fortune. It's okay. In Shaa Allah, one day I will meet my fortune, a woman who will become my wife". And my disappointed feeling because I could not get her gone immediately.
Sister Sara, I understand if you feel interested to that guy and want to get him. But as you see, he is not for you, but for someone else. It's means he is not your fortune, but someone else's fortune. And if you believe that everyone has his/her own fortune, then you will feel optimistic that in the future you will meet another man who become your fortune, a man who will become your husband. In Shaa Allah, it will make you able to erase your special feeling to him.