Yes. After my H retired from the military, where there were few interactions with women co-workers, he ended up in a job where he worked closely with 3 women. He talked to me about them all and he had a protectiveness towards them because the boss was a misogynist pig, among other things. I was actually quite proud of the way he looked out for them.
I also started to notice a weird thing. After years of marriage where my H never left the toilet seat up (this was not really a huge thing to me, but it must have been to his mother) he started to get lax about this. It occurred to me that it was a form of taking me for granted, although I didn't feel that in other areas. But added to this there was the one woman co-worker my H spoke the most glowingly about. I teased him about it even.
One day he had a softball game that was rather far away. I offered to go with him, but he practically begged me not to. When he left I began to stew about it and was convinced he was really meeting with someone else. Imagine my surprise when he called a couple of hours later to come get him and take him to the ER. He was really at the game and got injured! Ended up getting ACL surgery eventually. I realized that all my fears were silly nonsense.
A year or so later my H left that job, at my urging, because the boss was making him miserable (although he sure enjoyed being the KISA with those women co-workers and it was hard for him to leave them). He met OW at the new job. They were both new, had orientation together and training together. Within a few months they were in the A.
It took me a long while to realize the A because his cell was riddled with calls to the women from the old job (still talking about the boss until eventually they all left), but then also new women (yes plural) at the new job. We had a talk about it and he cut down the calls (all made on his hr long commute). I trusted. I'd had that silly notion with the SB game, remember? It was a while before I noticed that all his calls were then to one woman, every day, day and nite....well you get the picture.
When the A finally came to light my H insisted that there was no involvement with any of the women from the old work place. But H did agree with me that those relationships (with all the validation and KISA elements) had become a gateway drug for him to move onto an actual A. For one thing, those relationships had allowed him to trust friendships with women, so when the OW befriended him his boundaries were flimsy. He fell hook, line and sinker for all of the OW's manipulations and was in the A before he even knew what was happening. He was like a babe in the woods.
My H's behavior towards me during the actual A was so completely different than when he worked with the 3 women that I eventually did believe him that nothing happened with them (although one of them I think actually did have a thing for him but never made an advance). But I still wonder about that day with the softball injury. It was like a foreshadowing of things to come....