Hmm, sometimes you just don't see it the way everyone else does.
Throughout the book, I felt nothing for these characters. I didn't see any reason for either one of them to be with the other and the author didn't give me a clue as to why Ollie would want to be with Ben at all. The fact that Ben was all over himself worrying about where Ollie was the day after his surgery didn't make any sense but even more so later in the book when he wouldn't even give even a tiny bit. It just didn't work at all in my opinion. And Ollie? There was just nothing there until the end and even then it fell flat.
Of course, you have the whiny, jealous sister. The only thing interesting about this book with the diabetes. Everything else was standard fare.