I told this guy I like him now he's y!?

I told this guy I work with that I like him. We can't date so it is just kind of there. He likes me too, his friend told me, he was just afraid that I liked him because he liked me. Anyway, I am a pretty and nice girl, there are a lot of guys that like me. My friends tease me because the guy I like isn't "hot" and he can be somewhat of an @ss to people. Well now he seems to be acting almost y. He keeps asking me if I'm okay in almost a condescending way. He's also been more flirty around other girls. He's not flirting flirting but he is more open and talkative. What's going on?