current relationship is revenge. it is not only a wrong way to start a new relationship but has also been an awful flop, and if you're not even sure of your new flame's last name, then you should know it's over.
all in all, a bad experience for all the parties involved.
what went wrong here? simply speaking, this was not a relationship at all. it was an arrangement. the basic premise for a relationship should be love and a common desire to keep each other happy. if you started yours with the objective of getting revenge; well, then it's going to be a pretty bad experience for you and a worse 