I would advise you not to fret, because at age 24, a large percentage of relationships that are currently in place will not last. Her current commitment to her boyfriend may be genuine (and wouldn't you want that quality in a prospective girlfriend, to be loyal to her boyfriend regardless of other offers thrown her way?) however, at such a young age, people change, things shift, engagements fall apart.
If it you have to think about her, take this time to see her with a more balanced view. She has many positive traits that you appreciate, however what are her annoying qualities? It is helpful to stay balanced when viewing someone who is a crush, because no one is ALL good qualities.
Secondly, if you could meet more people and casually date others it would give you a chance to add to your experiences. Also, if she sees you date someone else she will know that you are not obsessed with her in an unhealthy way, and may even feel jealousy that you forgot her so easily. Maybe that will help her take inventory of her feelings about you, but if there are none, you are best to move on with your activities and interests.
Just an opinion from one girl!
What is interesting about this girl is that she knows I am an aspie, and finds it quite interesting and OK. That is one of the qualities I actually found very intriguing with her. She is not judgmental and seems to have the patient mindset that is required to deal with me.
About the bad sides, she may have plenty. I just wanted to get to know her much better. My feelings for her were not that much more than this, but still I find it so very disappointing that I won't have the chance. Perhaps more disappointing than I had expected.