An 18-year-old feels sidelined by her friend's strange behavior regarding a small gathering.She shared what went down on Reddit's "Am I the A******" forum.Her friend Gemma invited her boyfriend Ben and another couple to a sleepover.The trouble was Gemma refused to invite the Reddit poster."She said she was having our mutual friends who are in a relationship over and my boyfriend Ben for a sleepover,” she wrote.When the poster asked if could join, her friend said no because she “didn’t want to be the fifth wheel”.Reddit users thought the friend was being strange