Describe eye contact between two people attracted to each other? Thanks!

How would you explain eye contact when you're attracted to each other? I met this guy who works at the gym and when we talked to each other we made intense eye contact. Our eyes never broke contact... An normally doesn't someone look away at some point of the conversation? Also his eyes seems to get bigger/wider. To me, it felt like we were really looking into each others eyes

Just wondering what to look for. I found him really attractive so I hope I wasn't imaging it!