Curiosity Overwhelms Me at Work

I'm a married doctor, but lately, I've found myself inexplicably intrigued by the idea of exploring something more with my assistant, Jane. It's not like we haven't had flirtatious moments before, but this time it feels different, more intense and less playful. The thought of her in ways beyond professional boundaries has been swirling in my mind for weeks now. I feel both excited and slightly unnerved by these new desires. Is this normal to feel towards someone you work with? What should I do?