Have an opinion?
Firstly, were you two actually in relationship officially, or did you just assume it? If you were indeed in a relationship with him but he denied it, he was just being a jerk. Pay no attention to him even if he is trying to make you jealous. You did the right thing by moving on.
We was in a relationship
Then just ignore his attempts to make you jealous. Don't bother. He will stop doing this once he realises that his attempts are failing.
Hardest part is that we work together
Oops! Now that's a bummer! Dating co-workers is always risky, for this reason. :(
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