Well, I have no advice, but I will tell you that the same exact thing happened to me a couple of weeks ago. My T had to leave for a personal emergency and well.....long story short, he left me a voicemail that he'd be out for the entire week and he thought he told me that he wouldn't be back til the following Wed (he didn't) and I felt like he left me hanging. I didn't know why he was gone and I didn't know for how long. I didn't know squat. So when I called the office at the the end of the week to find out what in the H-E-Double Hockey Sticks was going on, the receptionist gave me the scoop. It was an innocent slip, but it made me feel AWFUL.
I should have heard it from him not her. When he came back I didn't tell him about the slip or that I knew anything, mostly because I was exhausted from thinking about it and I just wasn't in the mood anymore from pure disgust. Is that the healthy thing to do, not talk to him about it? I don't know....probably not. So as I said, I have no advice, but I do know where you're coming from.