Five bright, round, white lights in formation were seen, three together and two together, but then they suddenly disappeared.

I was sitting on a boat in the middle of a small lake at night, with the boat light off, and my boyfriend and I  noticed five round white lights high up in the nighttime sky.  They were in formation---three together, and two together.   They seemed to be stationery, but could have been moving (they were very high).   We watched for a few minutes, amazed, then turned the light on in the boat.  Suddenly, two disappeared... then the other three!  It seemed as though they had noticed that we were there, watching them, and decided to take  off.   But they didn't seem to fly off----the  round lights just totally disappeared.    This account is my best recollection.   I was in my late teens, I believe.  We were not under the influence of any alcohol or drugs.   I am sorry--I do not know the exact year, or time of night (I only approximated.)
Witness indicates that date of incident is approximate.  PD