There are tons of cute and innocent questions about Gillian in his tag and yet he picked this one. I »m not sure how to interpret it but it sure means something

That’s crazy that he answered this one. I didn’t even expect him to talk about Gillian, and if he had, I would have thought it would be XF related and character related. So yes, it means something, especially when you can hear his agressive tone of voice through the lines. To me, it means the song is indeed about her and that he still gets agressive when he has to deny his relationship with Gillian. Except this time, he didn’t have to!