He could be shy. I agree he could be shy or have a policy of not dating co-workers. If either of you are in a relationship or married, it's definitely a good idea for him to put space between you, unless you want an emotional and possibly physical affair to occur.
asking him would work
dont talk to her shell get the message
Get to know him, ask him out for a meal or something. But don't let things get in the way of your work.
he will ignore you
Wait, you have made your feelings known and he will either respond privately to you or ignore the incident. If he does ignore what you said then move on, he is not interested in you.
http://www.wikihow.com/Know-if-a-Guy-Likes-You
The best thing to do if people say that a person has a crush on a boy and the other person says no but secretly does is to ignore them. One way to get a guy to know if a girl has a crush on him is to always smile at him.
You can try talking to him ... if that doesn't work - forget him.
happens allthe time
If a guy picks on you all the time or always tries to make you laugh or if they always stare at you my advise girls ignore them and they will want you more.
Ask him!
Take your shirt off with him.