Alona and Will had such a real and organic relationship. We saw them grow together in their bond and their characters. They made one another better and because of their bond growing stronger they, personally grew stronger. That's what a healthy relationship is all about.
I also enjoyed that even at the end they still have more places to go both in the relationship and in the series. Most YA involves insta-love, which is fine and epically romantic sometimes, but it is good to see the work and revelation that is normal in real life.
How I enjoyed my weekend!