Why did He Flirt with me and then back off?

[Anonymous]

A coworker of mine flirted with me the First Time we Met. I also Cought him staring at me from afar but when I Talk with him He seems very stiff and Cold. Why is that? He seems to be upbeat and extroverted with anyone else.

[Guy13]

You may be the one that he is feeling things for. We're nervous around those people. Especially, if he is all happy and fun with others. Give him soft smile and eyes when you see him. Talk about your bucket lists and work local things you like to do into the conversation...

[Wise4myage]

Don't waste your time with co workers.

[Anonymous]

Why did he?