How to deal with seeing the man who broke my heart?

my heart is broken by this as*h*le I work with.. we started dating a few months ago and he called me and was sweet talking me and was talking dirty and then he switched gears and started telling me he didn't think we should see eachother anymore.. which sucked because we saw each other at work today and the mother trucker had the nerve to try and flirt with me... I didn't show any emotion to him at all because I didn't want him to know that I am devistated...

Did he give you a reason for not wanting to be with you? Maybe it was for the best that it was only a few months and not longer, now you can move on with your life quickly and find someone who will be better for you. You should probably ignore him if he flirts with you, or if he tries to talk to you about anything that's not work related. He will eventually realize something's wrong and maybe then you two can have a serious talk about how you feel. Who knows, maybe you will end up as friends after?

Have nerve to flirt back and laugh in his eyes.

Sounds like he's playing mind games with you and leaves you feeling uncertain as to which way you'll react when you see him. This could be a signs of an abusive character. What's his relationships in the past been like? Have they all ended in failure? From what you said, I would be wary of him. Working together doesn't help. Maybe you should look for another job.