Both personalities probably, or none. Remember they say "Believe nothing he says" so you should not take anything he says seriously at this point, good or bad. He's confused.
However, he knows he is coming to live with you (for good?) this week and perhaps the confusion is hitting a higher level at this moment. Once he gets past the anticipation of what might happen and it actually happens, he might settle down a bit.
If you want to keep him in your life, you really have no choice but to be patient at this point.
