I have a co-worker that sends mixed signals constantly. What are your IOI and indicators of non-interest in guys?

Also I got laid off today, so I told him by Facebook that it was nice knowing him. He responded with "will I ever see you again?" Would this mean anything?

EDIT: http://www.reddit.com/r/relationship_advice/comments/d2puw/what_do_his_actions_mean_coworker/