Will this feeling fade away on its own?

I love my significant other (SO) to whom I'm married for long and things are working fine. Then comes a coworker in life limerent object (LO). She's below average when it comes to looks bit dresses attractively. We started working together on many projects and started getting to know each other well. She has a few health issues about which I started being emphatic. I started dropping her home after work. Really started caring about her well being as well. I spoke about her to my SO as well. She's really a good cobworker.

The problem started with me missing her like if she doesn't talk to me for a day or spends time with others I would be disappointed and thinking over it my mental energy would be drained, I feel disappointed if I don't walk her home. I wait for her to walk in to office. I wait for her attention. Talking to her makes me feel great.

I don't understand why this is happening. I am not finding any reasons. My SO is good looking, genuinely caring. Why this LO makes me so obsessed when no one is actually seeking her. I laugh thinking over this sometimes but I know the feeling is real

Edit: distancing from her is not entirely possible as we work in same space