The empty Seat on the bus

"My ex best friend was in my kitchen, looking through the cupboards for her usual mug. I knew we weren't friends anymore, but I didn't want to mention it and ruin whatever this was. We were laughing about something on her phone. I can't remember what, just that I leaned over without feeling awkward, like I used to. Then we were waiting for a bus outside my old school, and I suddenly remembered how angry I'd been with her. I tried to bring it up, but she asked if I still had her sweater. I said yes, even though I don't think there ever was a sweater. When the bus came, she got on while I was checking my pockets for fare. I could see an empty seat beside her. She put her bag on it, and I couldn't tell if she was saving it for me or not."