Excessively secretive

Why is your friend being so secretive? What has happened if he was once an open book? Think about it and try to figure out the change. Something must have happened in his life if he is now an absolutely reserved and cautious person. Communication then becomes almost impossible since you never get any clear answers to your questions about his family, career and life. You may even catch him lying. Try to tell him that you see the difference in his character and personality.

Watch their eyes

Eyes cannot hide the truth unless you are a professional poker player or an experienced spy. If you friend whom you have known for ages is looking away while communicating with you or other people, it is a sign that he is hiding something. Their eyes may look as if he is looking for something around. Well, the bad part of it is that this is a typical sign of someone who is lying. Simply watch your friend’s eyes and compare to how he looked at you some time ago. Is it just his usual habit or is it really some sort of change?