"When I get a letter from my second pal he goes on to say that he is lonely and no one writes him and all I can think is "well no wonder!!!" or "I can see why". "

You could bring this up to him. You don't have to be mean about it, but sometimes it's good for someone to know what it is they did or do that drives people away. He's probably not aware of how his thoughts and actions are perceived by others. Who knows, if he knows what it is that bothers you, he might actually stop doing it.