Why would a man start avoiding me (sort of) after a serious talk?

He is my coworker , there is an attraction between us. We went out 3 times, we are touchy with each other, we confide in each other and we talk a lot. Two days ago we chatted for 4 hours about "trust issues" and he's said that "trusting him might turn bad for me", because I've known him for only 4-5 months.

When I asked "why?"... he started changing topics. Then I never backed down... I wanted to know the answer. He asked me "why do u trust me?". I've pointed 2 reasons and made a hint about a third one. Soo we sort of went to "if you are not answering my question I won't answer yours either"

It was almost midnight, I told him I'm going to bed, cause I won't be able to wake up and he joked about "I told you I should come to your hotel (I'm on a business trip) earlier today, I would have waken you up"... and I said "well, that was a joke, wasn't it"... he "well how do u take it?"... me " you tell me, you are the author"... he "then suggest"... me "maybe you were joking, cause otherwise you would have come" ... and he continued "did you invite me?" ..."well, if you are indeed not joking, you can come"... he "too late". And then he wished me good night and told me "we will talk", but hasn't contacted me since then. It's the day 2.

Why would a man start avoiding me (sort of) after a serious talk?
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