I’ve been married for several years. Things have gone stale. I have a younger coworker who is giving me a lot of attention. I am infatuated with this person. I know that this attention is causing me stray mentally. And I find her very attractive. I need to let this go.
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Comment section

You are half the reason it is stale. She will find out. Fix it or don't disrespect her and do things right.

What happens when the girlfriend tells the wife after you don't go fast enough for her?

Think about where you want to be in five years. Do you want to stay married? Do you want a momentary fling? Can't have both. Maybe work on your relationship and see if it improves.