Your friend only for as long as they get pleasure or gain something from the friendship; only as long as it does not cost too much.
When a friend is down, I help him out. But when his life falls into place and mine isn't going so well, where is he to be found? That's a conditional friend.
Also Good Time Charlie
Yeah, Mike's my conditional friend. As long as I have an extra girl to throw at him, he'll hang around.