Freddy, the typical guy he was, missed her subtle cues about Archie. She didn't know the young man and he was just getting to know this version of Betty so he didn't know about the sometimes complicated relationship. "Oh! I can't wait to see him!" He missed Jughead, but he didn't want to mention that to Betty in case it made her sad too. However, he was determined to make Archie and Betty feel welcomed out of loyalty to his long-gone friend.