How to be normal around your student who you once had a crush on?

Going anonymous because I fear someone I know will notice it and my username is pretty much something people can associate with me. I'll delete the post soon.

Now please listen to me before you all start getting worried- he wasn't my student when I liked him. Around 3 years ago we were in the college together: I'm 2 younger than him, so I was in my honors final year and he was pursuing his post-graduation. I liked him A LOT but he had no clue. It's no ordinary crush, I would say it was very very intense. Then I moved to a different university to pursue my postgraduate degree and didn't know anything about him. Later I cleared a national level exam and now I'm working as a full-time, earning researcher at a university.

Recently, I received a call from my college asking me to help the unemployed former and current students by teaching some voluntary classes, particularly on the national level exam I cleared. I agreed. However, in my first class (online mode though) I noticed him there. He asked me some questions he had in the end of the class, and I again felt the nervousness I had years ago. My voice trembles and I struggle to keep the camera on. I don't like him anymore but when I did it was very strong and that memory still controls my impulses sometimes. How do I handle this? Please don't be mean.

How to be normal around your student who you once had a crush on?
Post Opinion