I think some early signs is how he presents himself. His body language. If you listen watch and learn him through how he does things, it might help to realize what kind of guy he is. I am sure some guys can hide it if they are asses I guess you could say, but then some show it without saying it. Not sure if that helps. I had to learn that the hard way when I was 16 if you know what I mean? Goood luck babe!