welp, saw him looking at me again today but he didn't say anything. he kept popping up here and there right near me, but he takes off like a frightened squirrel. he magically appeared near the door when I was leaving so we just said "hey". he knows what time I leave everyday, and it wasn't time for him to leave, so it was most likely on purpose. the saga continues...;p
You will drive yourself batty trying to interpret every little thing as a measure of his interest in you. You know that, don't you? Do something. Even if it's not direct.