Friends are overrated. I tend to ditch people the minute I don't have to see them everyday. High school friends, university friends, former jobs' friends. I don't hear of them anymore, nor am I interested in getting in touch. I currently hang out with my coworkers of two years but I know that if I quit, I won't see them again (unless by chance).
Same for me as well. I just have a hard time keeping in touch with people if I don't have to see them on a regular basis. And it doesn't bother me... I'm sort of a loner, and I have my captured sex slave to keep me entertained anyway.