I am having trouble reading the intentions of a person I thought was a friend, but now I am not really sure what to call him. I am not sure whether he is avoiding me on purpose because he's too shy or doesn't want to talk to anyone or he has reasons for not contacting me that might be beyond his reach; We used to go to movies regularly and enjoyed each others company; We shared similar interests and shared some of the same personality traits; He was so eager to really hang out with me again, when we lost contact for several months that he would be waiting for me in the mathlab room where I would work my mathlab shift, ready to begin our luncheon. He is more introverted than me and once confessed that the reason he missed some of our outings together is because he avoids socials situations frequently because of trusts issues. I am not sure if he is telling the truth; He was the only person I considered a real friend in college. I am certain he felt the same about me; I tried contacting him through phone and email, and he never answered his phone; His actions have really frustrated me for months and I don't understand why he just stopped returning phone calls out of the blue;.IS there some psychological reason why some people would exhibit this type of behavior, i.e. being a genuine friend and show them you really want to spend time with them and then one day out of the blue just stopped contacting them all together?