Yeah that hurts when that happens. It makes you have trust issues towards making new friends. People can be so rude at times and honestly, just like what some of the other posters said, I do believe that in these cases, people who make up lame reasons were either too cowardly to tell you the real reason why so they made up a reason or they weren't a real friend to begin with and were looking for ways, any way possible, to get rid of you once they found someone or a group of friends they liked better. I know exactly how you feel.