Relationship help

So I just need some advice. I took my boyfriend to one of my friends wedding yesterday. The first wedding together. Seven been together or almost 7 months now and as we were dancing I felt like he was staring at this one girl. It wasn’t just one glance but I kept seeing his eyes shift continuously at her. I couldn’t tell if he was looking at people dancing or if he was just looking at her a lot. But I felt like it was her. I got a little sad and didn’t mention it. But now im feeling a little down I

Thought I’d be able to brush it off by the night but it still doesn’t sit right with me. Am I overreacting?