It was very likley her. If HE ended things then I might think otherwise, but if she threw him away then he is going to be pursuing her for a while and WD will take a lot longer.
Just because he said its over, doesn't 'mean it is over in his head. If He didn't end it, then HE still has to end it in HIS head ...and THEN after THAT the WD period has to process in him.
He has'nt ended things with her, SHE did, so he's going to be purusing her for a while yet.
My guess is that message was for her yes. A VERY bad cover saying it was a joke.
This guy really has a lot of maturing to do. I would reccomend you detach, get a home of your own etc and leave him alone to grow up. If you pursue him and baby him like you have (I would'nt have let him in my home at all), he is never going to mature into an adult. I guess letting him live there is ok if he just stays there and lets you live your own life.
Its actually a good thing becasue its much easier for you to db and get yourself back on your feet. Its hard to get yourself back on your feet when you have no idea where your H is.
Just detach, stop worrying about him, HE has to process a LOT right now and you distancing yourself will HELP push him along.