Actually, Betty and Veronica were both of those things. They were competitive and jealous of each other, but they were also best friends through it all (which is often more significant than the whole Archie thing throughout the comics, in my opinion) and they are both completely aware of the fact that Archie is dating them both, and they're (sort of) okay with that.

To go back to comparing them to Johnny and Ripp, they're okay but they're not okay (and I think the comparison holds up pretty well).

Archie, though, was never considered greedy or selfish for having two girlfriends, which is something that would probably have been more likely to happen if he were a girl. Archie could do no wrong.