I don't know guys, I think that maybe we're processing this from the point of view of our protagonist, Faye. From his point of view, FROM WHAT HE COULD SEE, he was hooking up with one chick, like he had so many times previously, this outwardly strong girl who was willing to give him shit, who was his intellectual superior. Who would obviously be able to handle anything, right? So, he sleeps with another girl, and feels terrible about it, because he really did like Faye. If he didn't, he wouldn't have had any problem with it: she was just a hookup, after all. So he fesses up to it, and instead of being defensive at her aloofness, he feels worse. HE HAS SOUL.
I really sympathize with him. I've never been in this situation, or anything remotely like it, but I think I can understand why he's feeling as bad as he is: he really likes Faye. And Faye doesn't know it.
On another note: the minute I'm willing to give up my severe insect phobia, the rolly-poly bug will be the first on the "cute" list.