he's acting like nothing happened?

So a guy at work and I kissed and made out several times and he made it clear he liked me. Then his behaviour suddenly changed, gave him space and then told him we should stay as friends. He agreed and I said cool no problem. Then he kept going on about how he's been dating a girl for the past few weeks and wasn't looking for anything until he met this girl. After that I didn't message him for a few days (I am over the situation now).

Messaged today to do with work (I have to work with him on same project) and he's talking to me in a very professional way. He is acting like nothing happened, while I am glad he's acting professional (could be worse), I am still annoyed the fact he was horrible about it and refuses to clear the air. What should I do?
he's acting like nothing happened?
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