The two reconnected really well in a friendly way, and it almost seemed like everyone was overreacting, especially since Amy was getting updates from everyone on all sides, and she might not have been a green monster, but you could tell she was bothered..
At the very beginning of the episode, Sheldon and Amy were on good terms, and they were happily communicating with regularity.
And nothing spells sitcom like “romantic misunderstanding that inspires misguided jealousy.”
Then Ramona arrived, and suddenly Sheldon started doing things that made Leonard and the others highly suspicious, like allowing parts of himself to be touched without immediately reaching for the Purell.