All of this I discovered well after the fact, of course. There was simply too much camera footage (almost 40 hours' worth!) to watch more than the highlights at first. I didn't realize the full extent of Tanner and Amanda's connection until weeks later, otherwise I probably would have panicked into interfering with it while it was ongoing. No question, they had stopped being fuck buddies and crossed into true lover territory. I still didn't think they could be in a sustainable relationship, even if I wasn't in the picture... but their closeness was concerning.
By the time I made it through all the footage though, Tanner was long gone....