What would you do if you fell in love with your best friend, but you were both married?

One of you is verging from the beginning of the friendship with more than friends and tease and flirt with another. And even brag how patient you are while persuing that person for few years.
You would tell your feelings and distance to save your marriage
You wouldn't tell your feelings and distance to save your marriage
You would tell your feelings and continue the friendship at same intensity and closeness
You wouldn't tell your feelings and continue the friendship at same intensity and closeness
Other/explain
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What would you do if you fell in love with your best friend, but you were both married?
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