Reading through the multitude of questions DPG is asking, it makes me question the concept altogether - the premise raises too many logic flaws and questions.
The premise comes across as a heavily contrived attempt to force together an odd couple, rather than let the odd couple come together as a result of the premise. For example, if they are both students at the same school, then the logic of them connecting inherently exists in the premise and requires little explanation. However, as it is now, she is a famous singer and he is a student - they are worlds apart from each other...
Continuing from the previous point made, if they are both students at the same school, he could be taking classes via Skype (as a result of his agoraphobia). She could find his mysterious nature intriguing, which prompts her to make first contact outside of class.? This doesn't have to be in the logline, but could give you a clearer understanding of the mechanics behind the premise.
Ultimately, what's important in romcoms is the force that keeps the lovers apart. In this instance it's his condition, therefore, best you think of a good set of actions for him to take that will help him get over it. In the last draft you wrote "...he must overcome his fear in public..." but what does this actually mean? What does he do, specifically, to overcome his fear? Remember also that his fear is an internal thing, the camera can't show him suddenly not being afraid.? Therefore, best to come up with a good external manifestation of his triumph.