"Despite having known him for almost a year, there were a lot..." — Ally Carter quote meaning

Despite having known him for almost a year, there were a lot of things I still didn't know about Zachary Goode. Like how soap and shampoo could smell so much better on him than anyone else. Like where he went when he wasn't mysteriously showing up at random (and frequently dangerous) points in my life. And, most of all, I didn't know how, when he mentioned the jacket, he made me think about the sweet, romantic part of the night last November when he'd given it to me, and not the terrible, bloody, international-terrorists-are-trying-to-kidnap-me part that came right after