What do I do, help?

I'm attracted and have feelings for my coworker however I'm married and I love my wife and stepdaughter. I told my coworker how I felt thinking it would scare her away with her knowing I'm married and she having a boyfriend. Turned out it had an opposite effect and she holds the same feelings I do. I hate that I feel torn in two like this. FYI. My coworker and I made plans multiple times to just go out on a date but she either cancelled or made up an excuse for not being able to go. It's probably for the best. But what do I do to stop wanting another woman. And yes I am very in love, sexually attracted and involved with my wife.
What do I do, help?
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