Why would he start avoiding eye contact with me?

I like this guy and I know he likes me. We use to be able to look each other in the eyes, wave, and smile, etc.

What I have noticed is that lately he has been around more, blushes more, and has gone out of his way more. In return I have been showing him positive attention back...waves, smiles, etc.

So things seemed like they were going good...getting along and what I had hoped would only move forward.

Now when he is near he avoids eye contact with me, although he still comes around, still waves, still talks to me...but won't lock eyes with me. The only time I see him looking at me is from a distance and he will wave but not be smiling, or when I just happen to catch him looking when he doesn't think I will see him.

I am just wondering what has changed. Does this mean his feelings have gotten stronger and maybe he doesn't want me to see? or maybe he has not become scared? I know he likes me, so I can't imagine it is related to that..the not interested thing. Just trying to get some ideas. And I know he sees that I am looking at him from his peripheral vision as I am trying to get him to look at me.
Why would he start avoiding eye contact with me?
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