Has my crush come to know that I use to like him?

It sounds silly but yes. I had a casual crush on a coworker at the beginning of my work in May. He was smart, talked well and these traits attracted me. It was nothing serious and slowly I got over it. However, recently I have started noticing that his behavior towards me is changing. He talks to me a lot these day (strikes up conversations whenever we meet each other), looks at me a lot whenever another girl is beside him (probably to see how I'm reacting) and sometimes is very nice towards me (we had a group project with lots of work and since I already had a lot in my plate, he asked in the group if he could take some of my responsibilities). While this is nice, I have a fear that he knows that I liked him and doing all these things to confirm that. What if he makes fun of me now? I am unlikable so he definitely isn't treating me differently than others because he likes me. Does it seem like he knows?

Has my crush come to know that I use to like him?
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