I asked him out, he said yes and now he ignores me. why?

Anonymous
Please help me understand his behavior...
I like my colleague and I though he liked me too, always smiling, always nice to me etc.
So I asked him out on Saturday and he said yes, we can meet, but we didn't make any clear plans.
Then, all week at work he completely ignored me. Today I went straight to him and asked if he wanted to go out tonight. He said he was busy. I asked if he was free tomorrow. He said no. So I said "if you don't want to go out with me, it's ok, just tell me" and he said "I really am busy".

Why do you think he is acting like this? What should I do about it?
I asked him out, he said yes and now he ignores me. why?
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