Relationship anxiety

Okay, I’ve always had anxiety and most of which is tied to relationships. I hope this is an appropriate sub forum to have this topic in.

So, I’ve been with this girl for about 6 months. We’re close in age, late twenties and she admittedly has many male friends. She has been involved in a work activity and there’s a male coworker, whom she’s said she didn’t have interest in (made comments unprovoked), who she works with closely on this over the summer.

Recently, they had to go somewhere to meet others and decided to carpool with this guy. He’s single, a bit older than her, and is playful (I’ve never heard it crossing a line). This made me super uneasy.

I get the vibe that this guy wants to get close to her and I am actually upset that my gf decided to be okay with carpooling with him. The excuse of saving gas just didn’t make sense and makes me a little upset. My anxiety has been tied to our somewhat differing views. She’s very outgoing and talkative to males, and I’m introverted to an extent. I also don’t believe men and women can legitimately be friends without one party having some type of feeling or “desire” for the other.

Do you personally feel that I’m overdoing this? They’re on an outing with others, but going together while I’m at work. Part of this admittedly, is my jealousy and also my anxiety that something will happen or he will flirt with her and me not knowing. I have trust issues with almost everyone, but I do trust that when she says she loves me and I mean the world, that she means it.