Real good buyer willing to bid for the item since lots of competitor

1st dealing fast and good. 2nd Dealing turn bad, Just my luck Went to Buyer block and in the end give excuse and ask next day come. (I'm doing that favor only once and no more 2nd time) Thus decided not to deal with him anymore and block him. Buyer is a school boy. Can not trust this buyer anymore. Notice buyer change name a few time.