You seem really bothered by the last text he sent you. It seems to be the thing that triggered a downward spiral. If I remember correctly, you texted him a photo of you guys that you took during that last session. He replied with something like, "Thanks, I'll save everything on this phone before the factory reset." He's basically saying he will save the photo and other photos and texts between you. I'm not sure why that upset you so much. I think he was trying to say that he cares and wants to remember you so he's saving everything. Why did that text make you feel like everything was fake or you were just his job?
Maybe if we talked about that text more we can figure out why you feel so bad.