Should I even worry about it?

Let me start out by saying that I’m the jealous type. I’m also very insecure with myself due to past relationships. Almost all of my relationships have consisted of me being cheated on, being trapped in an emotionally unstable relationship (he was suicidal), and/or constantly being the gas lighted by one specific guy. My fiancé and I have been together for 2 years and I feel good about myself finally. I feel good about my appearance at least. He motivates me to do anything and everything I want to do. He’s amazing and I do trust him. However, there’s a girl at his store that constantly flirts with him. When we go in there when he’s off the clock, she doesn’t talk to me, she talks to him and it’s the same way when I go in there alone. She has a boyfriend too but it just feels like she’s constantly flirting with my fiancé or has a thing for him. I don’t know what to do. I haven’t mentioned anything to him because I know there’s nothing he can do. I’m not gonna tell him to quit his job because of her, even though it does make me extremely uncomfortable. What should I do? Should I worry about anything or is she just one of those disrespectful females?