He seems to purposely stay away. Why would a guy act this way?

TicTac
He knows I use to like him and I think he use to like me.

I am trying to decipher his strange behavior. There will be a week or two where it seems he is avoiding me. I say this because I won't see him at all, even though we work in same office and I know he is in. Then the next week or two he will be around and go out of his way to come to where I am, wave at me, make conversation and even at times seems like he can't stay away and I will see him coming around several times within same day even.

Then the next week or two we are back to nothing, and this pattern keeps repeating.

Usually most guys I have dealt with are pretty straightforward in showing that they either like you or they don't, whereas this guy seems like he can't stay away and then next thing you know he seems to purposely stay away. I have never seen such an extreme.

Why would a guy act this way?
He seems to purposely stay away. Why would a guy act this way?
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