Imaginary, or real?

Ellie is quite the social one in her high school, of course, she wasn't always a social butterfly. From age 4 to 12 Ellie only had one friend, and he was perfect. Alex was the best guy friend you could ask for, and he was cute. The only problem was that he was imaginary. Or so Ellie thought. On her 16th birthday, Ellie starts to see a new boy at school and decides to make friends with him. Too bad they are already Best friends. She finds out this guy is Alex, and she is determined to find out Why he's come back, and why everyone can see him. Ellie is stuck in between choices of whether this boy she loves, is real, or if he's always been in her imagination.