I've had a similar experience. I had asked a girl I liked out on a date, but it had to be a while after my asking, since the both of us had exams coming up. For the first few days after, my feelings hadn't changed - I thought she was really pretty, and I was excited by the prospect of dating her. After 4-5 days, however, my feelings had begun to disappear. The more and more realistic a romantic relationship with her seemed to me, the less and less I was interested that way in her. After a few more days, I had become completely disinterested in dating her. I let her know this and she's been absolutely fab about it, we're still good friends. Anyway, I think this experience, while not universal across the community, is not all too uncommon for aros to feel. You could be frayromantic or something similar to that, I'm not sure of the exact terms.