Paranoid Girlfriend Advice 😟

So my bf and i work at the same job. Almost everytime i see him, i see one particular female coworker tagging right along next to him. They'll walk off together and then will come back together sometimes. i trust him and I'm sure he wont cheat. He has talked to other girls on social media in the past but thats whatever. But it kind of makes me uncomfortable to just see them around each other all the time. When i look up and see him, she's right there. Its just kind of weird like damn why are you always around my dude. I talked to him about it before and he gets mad when i bring anything like that up cause it makes him feel like i dont trust him and think he's doing something. i love him too much and dont wanna loose him. But it just makes me uncomfortable. Am i just too paranoid???!