I think the folks going on about personal agency and relationship repair don’t get this
But there actually is. You actually entirely have a choice in the matter. Think it through. There are different ways you could go, but if you love your husband and want to be with your husband, then start exploring how you can repair your relationship. This could be the impetus toward something good.
Get some novelty in the sexual part of the relationship
But there is. You have agency in this situation, on a lot of counts. You can choose whether or not you have an affair with the guy. You can choose whether you decide to work on your marriage and start figuring out what went wrong. You can choose whether or not to leave your husband. Isn’t it more empowering to think of what aspects you actually do have control over? It would be different if your husband had had an affair, or was leaving you and you were the one who was a passive agent as everything was playing out, but it’s not like that this time. posted by mermily at 5:55 PM on [6 favorites]
I absolutely know what this is like, and I encourage you to re-read Jacqueline’s comment above. Then do some googling/research on limerence.
The first time I read about limerence, it was a shock and a huge relief. This thing that had felt so overwhelming and isolating had a name and a history and a pattern. Just that realization was a big step toward lessening its power in my life.