Tactics to avoid my ex at work?

My ex is coming back to work in a couple weeks. He broke up with me at the beginning of his leave about three weeks ago. He works on the first floor in a different department than me (my desk is on the third) but I still have to go to his floor to help customers who are located near him.

What are some good tactics to avoid him? Just not look his way? Any other suggestions?
Updates:
+1 y
So yeah, I was told he came to my desk this morning but thank goodness I wasn't there.
Tactics to avoid my ex at work?
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