As far as I'm aware the University courses for Aviation are getting a bit stricter to make sure that the best candidates are being put through the Flight Training, this has a lot to do with the Success Rates as having low success rates for students is a cause for the Education Department to take a look at your courses.
It might not necessarily be you, perhaps many others were turned away, perhaps the others who got in were just of a higher quality which doesn't mean there was anything wrong with you but that you weren't competitive enough for this year. Get in contact with them and ask for some feedback on where they felt you fell short or weren't competitive enough and if you really want it then you'll take the next few months as an opportunity to address those items to give you a greater chance next time around!