He's talking about understanding facial expressions... and I'm reading his, and for some reason he just looks like he is about to cry the whole time. Not sure i

He's talking about understanding facial expressions... and I'm reading his, and for some reason he just looks like he is about to cry the whole time. Not sure if it's because he is emotionally positive about the things he is talking about, or upset about something. I get like that sometimes when I speak about things that mean a lot to me, so maybe that's what's happening. It's hard to tell, because I don't know him personally.