Is this a red flag?

Should I be concerned if my boyfriend talks more about other girls than me to his guy friends/male coworkers? Like he’ll talk about how hot a customer he helped with was and pretty descriptive stuff about them. But I’ve never actually seen any evidence that he talks about me. Besides letting them know when he’s hanging out with me, so they can plan a boys night out. I honestly feel like I’m at a strange place in our relationship, maybe I’ve just contemplated about this too much. We’ve been together for 3 years, and I’m 21 and he’s 26. Tbh I didn’t really feel any sort of emotions to see him say through text about how his ‘girl’ with a big booty came in and he should invite her to lunch... I literally just had a straight face 😐 Idk if I 100% trust him, or if I’m just not worried because the odds of him cheating on me with a beautiful woman he meets at work are pretty low. Is that bad? I just started wondering what his coworkers must think, like if he’s not serious about me and still looking for something else?

The reason why I haven’t brought it to his attention, is because I see no purpose in doing so. I already know he’s going to tell me it means nothing, and it’s technically true, like he’s not directly messaging these girls. However, I still feel kind of embarrassed since his guy friends know me and it kind of feels humiliating in a sense. Like he’s talking behind my back? Yet never talks about me?