I don't have enough true friendships so I can't really say - for most of the friends I have, we have a pretty shallow relationship, so it's rare that we argue or disagree. So I'm still friends with people I've known since primary school, even if we don't talk frequently. I don't make an effort to keep friends, but I don't try to lose them either. Besides, some of them are quite obstinate, and tend to stick around.