I’m insecure about my boyfriends ex

I know I shouldn’t be but I can’t help it. She was older, more experienced, absolutely gorgeous and they were very in love. Engaged even. He still calls her “Ang” rather than Angela and talks about her dogs all the time. I know he loves me, he’s made it very clear and obvious that he’s over her and I think I believe it, I’m just insecure about her. We live in a small town, I see her everywhere and it nags on my mind all the time, a little voice in the back of my head telling me I’m not as good as she was.