Why is he so confusing?

So after so long time my crush/co-worker finally knows I like him. He said just wanted to stay friends and I agreed. Just when the awkwardness starts to fade and things start to go back to normal he changes. He staring at me again when he thinks I'm not looking. When I go into receiving with one of the guys he will glance but not say anything, but when he catches me back there alone he starts the conversation and everything is back to normal. He was on his way outside for his break but one of our other co-workers ( another guy) stops and starts talking to me and he stops and talks to a co-worker from my crew while sneaking glances. I don't get why he is so hot and cold right now.
Why is he so confusing?
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