No different than meeting people in life in general. One day they're there, next they're gone. Moving, traveling, disappear without a trace, death. There is no guarantee in anything; that's just the nature of living, unfortunate as it can be at times.
Best you can do is treasure the memories if they were as close to you as it sounds.
id: ramuhs
Best you can do is treasure the memories if they were as close to you as it sounds.