<human>: So I hooked up with a co-worker a few times on work nights out over the last few months. We started texting a lot and he suggested going for drinks when we got back after xmas and I agreed. I haven't heard a thing from him since. I have to see him everyday at work and the conversation is just polite and all back to normal like nothing happened. We've never been alone together for any extended period of time at work.

I can't tell if he just changed his mind or is too shy (he doesn't seem to be). I'm starting to feel really awful every time I see him now and have an urge to text him to ask him what happened but don't want to embarrass myself since I have to see the guy everyday.

A family member passed away a few months ago too so I don't know if I'm just overly sensitive and more emotional than I would have been now but I think I need closure on this one so I can forget and move on.

What should I do?!

Summarize the given text in a few sentences.
<bot>: Haven't heard from a co-worker who I was supposed to go on a date with, should I text him to ask why?