Why is he sending me mixed signals?

My co-worker comes to my office all the time to chat, other colleagues already noticed and asked me if I have a new suitor... He texts me often even when I am on holidays and emails me. I like him very much. Two times there was the opportunity that we met outside of the office and then I always got a message afterward that he liked it very much. But he is never asking me to hang out in person. And when I am asking he says, he would like to meet but he is busy this week, maybe later and then I never hear something about it anymore. What do these mixed signals mean? I really don't get it. And no...he has no girlfriend. Is he maybe just bored and then I am good if he has nothing else to do? Somehow I get that feeling.
Why is he sending me mixed signals?
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