I started to work in one german company whose seat is directly connected to the seat of another german company, so they ve got some common space. I meet here one german co-worker from the other company. I see that he is quite talkative, friendly and nice to people he knows.I´ve noticed that he´s polite, he salutes if he is saluted but nothing more to my colleagues (he doesn't know them) . But when he is passing around me, he always stares, when he notices my stare(not often, I´m shy), he smiles at me(no matter how often we meet, e.g. we meet 3times per 5minutes, he smiles every time) . When i´m laughing with my colleagues he looks at me and smiles, when I´m passing around him, he turns around to see me or eyes me secretly.When he cant see me, cause I´m in a crowd he sometimes leans in order to see me.He sometimes tells me hello. Once we met in a hallway waiting for something, he was staring at me, when he saw my glance, he smiled immediately(I smiled too),I started to "scan" floor and he started to scan the ceiling with a grin but he did not initiate any conversation.No idea if he is single or not. Any ideas what does this mean?Thanks:)