Doesn't sound like it was anything as obvious as him saying something to you or you'd be rightly pissed.
So maybe it is more with you being uncertain whether he's told the friend you are back together? And wondering what he told people (i.e. does he just say you're back together or that he moved back in)?
Michelle - Proud DR Rockette S: 28JUL07, D'd: 29OCT09 http://tinyurl.com/27j9qo2