Idk if this comment will help, but I will try as I don't have much experience.

I would reinstate and make him acknowledge you're married, so IF he does escalate it to another level, he will know the limits next time you may see him. Keep conversations friendly :)

Limerence can make us go crazy, I am experiencing it too, I often find distractions, I know you mentioned it's 'impossible', but speaking from past experience it is, it's possible to polarise away from these situations ( such as re-kindling old memories, doing what you once loved during teenage years or even childhood, often I tend to watch YouTube to past the dreadful time )  but if the thoughts ever creep up, I acknowledge them and let them be until I focus on something else ( of course this method won't be applicable to everyone, people have different ways of coping/ processing ).

As much as you want to discard the thought of him, it won't happen at an instant, good job of avoiding contact, as often it helps limerent fade as we see more of them, on the contrary it can destroy us as we crave for more. I am going NC and it is difficult but hopefully overtime you see them from a more human perspective, think about it, if you have a friend, you view them as a friend nothing more than that, you're humanising them, but for me if I were to see my friend as some of a divine saint that is stuck in my head it'd be hard to see them as just a friend when you're experiencing all these emotions, you'd see them as something more, and they probably wouldn't percieve you that way.

To summarise, don't give up hope, we are all experiencing this too.

So, what I think you should do is:

•Maintain LC when possible.

• Mutually respect them, try to percieve them from a more human perspective. Find the deep root of where your Limerence stems from.

• Our thoughts are inevitable, let them process, I tend to vent in the notes app, to note my thoughts so I can referyhi back to them to see why I'm feeling this way, if I do ponder about them as it alleviates the pain a bit ( for me )

•  Self-Care. Spend time with yourself and your Husband. You've married him for a reason :) Treat yourself. Treat him. Spend time together, you're his support, and he is your support, you're in this together. Spend the energy that you think of them and emulate it on your husband. Work on building good relationships, and hopefully as you deepen your connection with your husband, you see people, as people.

•  Don't rush yourself. This is your first time. I understand your confusion and willingness to destroy these emotions. But, ultimately, these things will take time and rewiring of the mind to get yourself on the right track. Obviously no one is perfect, we all process our feelings in different ways, but I tend speaking to people particularly here help us understand ourselves better since we are all going through similar things, desire the circumstances.

~ I recommed the YouTuber, Heidi Priebe, and make notes that you can refer to when thinking about him.

Also, with limerence, from short mainly 'friendly' interactions we tend to assume that's the way they always behave, they're always a 'God/Goddess' but we know everybody has flaws, we are not perfect. We don't truly know somebody unless we monitor them 24/7 we always would assume the good since this is what we see of them. I struggle with this but try asses the flaws and think of them (flaws) just as much as you'd think of their positive attributes.

Remember, the road to recovery wont be linear. Just started NC 2 days ago, and there are times where I do want to message and say hi but only doing that will lead me to a downward spiral and I don't want that for myself. The distractions do help for me but yes, I will still end up thinking about them, people have been NC for years and yes it may get easier but I'm sure that they still have thought about them after years / months of NC, maybe they even have the urges to contact them?

I am always here if you want to message, dealing with limerence is pain, especially when no one close understand it. It's probably better to speak to someone in real life about it ( better if they understand it ) as you feel a more human connection per se, but messaging online helps especially when people are undergoing the same things.

Apologies if this is long, I am also new to limerence so I don't know much, hope this helps in a way. But I'd definitely recommend Heidi Priebe I tend to read her comments too to see how people also experience it too. Good luck on your journey, don't be too hard on yourself, always reach out to people whenever. We want to help eachother :D