I liked a guy a while back whom I've known for about a year. We used to flirt and I eventually accepted it as harmless fun and assumed he had no interest in pursuing the attraction as I felt he only thought of me as a friend. Today when I saw him he grabbed my arm gently and greeted me then leaned in to kiss me very close to my lips in public. I was taken aback as I hadn't expected this at all as he's only ever done that once before several months ago and last time I sensed that he was simply being friendly because we hadn't seen each other in a while. But this time, I felt like it was in an intimate sense? I have no idea why he did that out of the blue when we've known each other for quite some time and never even hug?