Does that happen to everyone? I never kept a friend for more than 2 or 3 years. I kept having to make new friends to replace the ones that walked out. Then one day, I decided it isn't worth it, so now I have no friends.

Even in an acquaintance or coworker relationship, some people haven't liked me for more than 2 years. Those that still do hadn't worked with me that long before they left the workplace.

Why do people stop liking whoever they used to like?