What do you do when you are sitting right next to each other? Just sit and watch? Any hint that she wants something more? I admire your self-control. I would typically at least put my arm around her for a bit and maybe rub her neck. Maybe you are well aware of what the result of doing that kind of thing would be. Does she ever initiate putting her arm around you or something along those lines? Just curious. I'm not advocating initiating. I'm just trying to figure out whether there was some kind of missed opportunity here.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt