Science Is Only Skin Deep - S3.E6

Fred needs an assistant because he's been working too hard lately. He hires a woman named Julie, and they get along very well. Casey feels jealous about this, but doesn't let it get to her. One day, Julie fell from a stool and Fred went to catch her. At that exact moment, Casey comes down to check on them. She becomes upset because it looked like they were flirting with each other. Fred explains to her that she's the only woman for him, and that there's nothing between him and Julie.