What do I do

We’ve been together 5 years. I have a problem with his coworker. She makes me uncomfortable, she’s called him inappropriate things, I’ve told him in the past I don’t like her, I don’t want to hang out with her, and I don’t feel comfortable with her around. Ive been saying this for 4 months. Last night he told me she asked to hang out with him, and he wanted to say yes but didn’t because “we had plans today” aka, stay in because we finally have one day off together. The amount of disrespect I’m feeling is unreal. Despite how often I tell him I don’t like her, despite me telling him my feelings and how worried I am, he doesn’t care. He doesn’t listen. He doesn’t respect me. I asked him “would you have said yes if we didn’t have plans”, and he said yes.

Does anyone else believe it’s inappropriate for a girl and a guy to hang out ALONE if they’re BOTH in relationships? Why the fuck is that so hard to understand? Why can’t he see it’s NOT OK??? I feel like he sees me as an idiot. He doesn’t take my feeling seriously... Does he not care I’m uncomfortable? Apparently so.

Update: Sorry, it’s not about trust. He’s allowed to have female friends. She’s called him daddy, flirted with him, and I’m fucking done with her. I’ve asked him time and time again if he’s cheating and he says no. I’ve asked him time and time again if he has feelings, he says no. I’ve asked him to speak to her twice about this, and he has. It’s HER that’s the issue, and I’m done feeling like it’s my fault. He can either respect how I feel or I’m leaving 🤷‍♀️