I kinda am in similar situation. I have a huge crush on this guy at work, but we work in different departments for almost five years, just I noticed him now (don't ask why, just did). We started to flirt lightly - looking into each other eyes deeper and longer as usually do, but we never talked (except "Hi"), started to bump into each other more often. Then I noticed, that he started to check me out (first time really obvious, but then very sneaky), staring when he thinks I'm not watching, when we were together at lockers he became nervous and always acted as he wants something to say, but never did, sometimes when we said "Hi" to each other I swear it felt like he saw just me and I saw just him, despite there were other co workers around. One day out of blue I just slipped into his locker my phone number (don't know what I was thinking:)), he called later, we talked for the first time and he threw idea to hang out just to talk, but didn't tell when or where just that we will keep in touch. And we are still keeping in touch for three weeks (meaning he didn't call me back since). I called him once but the answer still was "We'll keep in touch". I figured it was polite "No" and I think it's mainly due to the fact being co workers. Now I also starting to think that it wasn't a good idea to hang out outside the work, as it can become ugly at the end. I never dated a co worker before, that's why I kinda at first thought it will be as usual, but now after he kinda blew me off, I started to think he is right. Even now it feels awkward as I have to face him every day, after that sort of rejection and there can't be any flirting anymore, cause it will drag as again back to where we where. But if you truly believe you and him could work out, then you can stick by him and step by step move forward, but if you have any doubts and just want to know how it would be being with him (without any serious intentions) then maybe you should drop the idea of hanging outside the work with co worker, if you want to keep your job.