What if your ex boyfriend and you work together and its not working out getting back together?

Don't be awkward. Just pretend they're not there and work like you used to. If they say hi, say hi back and start up a conversation if you'd like. They are you're ex for a reason, and it's because they're not the one for you. Be your usual amazing self and don't be caught up with worrying over that person.

Look forward not back.

You can just be friends with them^^