Yah, I have one. She dated a friend of mine but she got bored of him cause he was interested in Christian purity and she was kinda immodest in dress and stuff at times, so she dumped him and ditched all her friends for her new boyfriend but he turned out to be a jerk so she dumped him and found another jerk and hen another and then another.... might I add that each one was her "one and only forever and ever". Yeah.... right. Anyhow she just wouldn't listen to anybody and since all of her good friends didn't like her endless line of boyfriends she decided to quit talking to anybody who wasn't her boyfriend at the time. I have no idea what she's doing now. It's pretty sad really.... I'll still be there if she decides to come back of course. But it's sad.
Oh yes. D: Pretty much all my friends change for the worse. I had a friend who turned into a bitch out of the blue one day because I was "immature and annoying" lolwut. I just act the same as I always do...XD;
I miss the old days as well. I once had a really good friend and we joked around a lot and always had fun. Then he turned on me and started hanging out with the wrong sort of people. The last I've heard of him was that he stole a few things from some store. It's sad to see people like that change.