Friends see off

Three friends were standing in a railway platform and chatting with each other seriously. A train arrived at the platrom. They didnt care about the train and continued their talk. When the train started moving, one of the guy noticed and told that the train is moving. They ran towards the train and two of them managed to get in to the compartment. The guy who couldnt board the train sat on the bench in the platform. Another who is watching asked him what happened. Then he told that I was supposed to catch the train . The other guy told, dont worry one more train is coming shortly towards the same direction. The guy answered in a gllomy way. " Actually I wanted to board the train and other two friends came to see off me"