An emotionally unavailable girl has rapid mood swings, moving from showing strong interest in one moment to showing next to none.
In the case that you have fallen for an emotionally unavailable girl, you most likely fell for her in these tender moments where she was showing strong romantic interest.
This is unfortunate.
When a person is emotionally unavailable, they have no room for you in their heart.
At least, not at this time nor any time in the foreseeable future.
When she likes you more than a friend, she wants to spend a lot of time with you, and is excited to do so.
Whether she has something else planned or not, she prefers your company and makes the time.
There are some differences you need to understand.
There is a difference between wanting to spend a lot of time with you as a friend and wanting to spend a lot of time with you as a potential love interest.
This is where you run the risk of being delusional, should you misconstrue the two.