User was a displeasure to deal with.

User commented on one of my posts to express an interest in my penguin for sale. As a result, I added user on Skype and messaged him, asking him about his interest in my penguin, to which I received no response. A few days later (today) this user commented on my post again to express an interest in one of my penguins, and of course I already had the user as a friend, so spoke to him on Skype, this time I was replied to. However, within six minutes of having posted on my thread (my response was incredibly quick) the user claimed to have already bought from another user, a seemingly impossible feat. I would be hesitant in dealing with this user due to their unresponsiveness and apparent tendency to back out of interest in items incredibly quickly. As a seller, this is very frustrating.