Guys, what does it mean if a guy is constantly checking you out but doesn't make a move?

[Anonymous]

I caught my coworker doing it many times. We've had some flirty chats in the past but he doesn't make a move to take it further. Is he not interested?

[Alex-Snow]

He likes you but may be shy or think that you are already in a relationship. Do you like the guy? If you like him maybe make the first move and ask him out? Maybe he is just shy or new to dating/relationships or even sex. What do u think?

[spartan55]

He doesn't think you are interested because you've likely done nothing.

[Anonymous]

He might be shy and/or introverted. He could have limited experience courting.

[Pterodon]

He’s waiting on you to make a move

[In_Trance]

Nothing