AITA for ordering and paying for food at a restaurant?

I went to a restaurant with my coworker. She’s a “higher up” than me and much older. I love and respect her and this one thing just stuck out so I’m going to share it. <br><br>The other day during work we met for lunch. She said she wanted a new restaurant and it was amazing, so I agreed. We eat there once a week now. <br><br>We drove up and met in the parking lot. We sat at the bar and ordered. We finished our food and the bartender said “I’ll bring you this one bill back.” My coworker looked at me and said, “oh you’re paying today, I go here often.” I tipped really good and paid. <br><br>I didn’t want to tell her no because she’s my superior. I make double what she makes and this just was very weird. I go to this restaurant one time and I’m expected to pay because she’s been going since it opened years ago. If it were a fetish thing I’d totally understand and this one time wouldn’t matter, but I feel like I’m a girl Duty to pay every time I go out with her. <br><br>AITA for paying?