We're both married but he keeps making eye contact?

I have a coworker that I have a lot of sexual tension with, we're both really attracted to each other but we have both said we want to keep it professional. We're both married and we work together so there's just no chance of thing moving forward with us.

I try to be civil around him and friendly but he always tries to make lots and lots (and lots!!) of eye contact. And I mean really prolonged, piercing eye contact. It's so intense, I can never hold his gaze.

What is he doing? Is he just finding it hard not to do that or is he trying to signal that he wants something more?

It's starting to make things really uncomfortable
We're both married but he keeps making eye contact?
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