Or it could be he is just cautious about dating someone they work with. As there could be professional reprecussions if things don't work out. As the saying goes to not go to the washroom at the same place you eat.
Probably good idea to play it carefullly as well for your work reputation and maybe that's why he didn't respond. Just try to act normal next day at work like nothing happened and see if he brings it up.
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