I don’t know what to think

We were all gathered in a table and he was straight across from me, I started talking with my friend next to me about some joke that happened in work. And we both started laughing and I don’t know why I turned to him and I was still laughing and I see him smile. Of course he was talking with the people next to him but I don’t know why we were both looking at each other. It was probably nothing but that moment that small moment I felt happy.