It's funny you say that. I get that vibe too. I haven't read anything from Teppei or Eddie, but when Riley and Dustin talk about the past and the way things I ended it seems that there are some sort of hard feelings. Either that or disappointment. I'm not sure, but I always see there being something. It's hard to tell via text though.
I think it was more so just disappointment. They all care about each other.