Would you be comfortable with it?

I recently started dating a guy and noticed that his best friend is a girl that is exactly his type to a T. I’m not exactly his type when it comes to physical traits, but I know that he still finds me attractive. I’m not entirely comfortable with it and have expressed it to him. He said that they’re just friends and that he doesn’t see her as anything more than that. He is just friends with her because they are so like, personality wise. I’m not sure if I believe it, I know that he finds her attractive because everything about her is what he usually likes in women. They haven’t been friends for too long, approximately 2-3 years and he said that he would never stop talking to her because she is his best friend. He has said a lot of things about her that makes me doubt that he doesn’t have any romantic or sexual attraction towards her. This is why I don’t feel too safe about them. I do trust him, but at the same time my gut feeling tells me that he’s not completely honest about the situation. They don’t talk as much as they used to since we started dating, but it still bothers me. Would you feel comfortable?