I think it is okay to become attached, it's one of the many reasons we keep coming back. Obviously not to the point of obsession or something, you have to know where to draw the line. And if you are vibing quite well with a particular guy, take him! The boys come and go from the bars, some may stay for years and others for a shorter time, and there is no guarantee you'll see him again (unless you have his contact details, but then again, he may have gone home). Enjoying reading about your experiences!