More of an acquaintance. Most happen to be egocentric people.
1) Share goodtimes with you, but when things get tough, they suddenly disappear.
2) Are like a gold digger, but for the joy of having a friend instead of money. They are only a friend to benefit themselves. Once they've had their fill, they disappear until they repeat the process with another and feel lonely again.
Turns out they were just a phantom friend. After the fun ended, she just disappeared.