Perhaps I might provide the perspective you seek.
I have been in this situation with my partner a few years ago and we have worked through it. Back then, he was working a gig job and met another female coworker. I didn’t think anything of it at first and have not been jealous before BUT in this case, I noticed a significant change in his behaviour.
First things first, he would not stop talking about this person when he got home from work. He said it was because he wanted me to be her friend, but I am more of an introvert and prefer my own company or hanging out with other fellow couple friends. One day, when putting my partner’s phone on charge, a text from her lit up his screen, in which she informed him of her ‘extracurricular activities’. I found this unacceptable and confronted my partner immediately. He did not see anything wrong with it and considered it banter, and granted I do have to partially agree because people in this line of gig work, can be like this.
Over the next few weeks, the situation became unbearable and almost drove us apart. It’s like he couldn’t grasp why I was so bothered but the truth is, it made me uncomfortable and somewhat threatened, maybe insecure. Eventually he did tell his friend that I don’t like their interaction, and she completely laughed at it, called me a few insulting things, like she didn’t even care she was hurting another woman. That, alongside flirty messages from her end and oversharing, cemented it for me, it was not in my head. She was attracted to him and did not respect that he was in a relationship one bit. My partner cut off contact out of respect for me but it wasn’t easy for him as I knew he cared for her as a friend, especially as making friends wasn’t easy for him. I also fully believe that my partner did not cheat despite the innuendos from his friend, but there was no space for her in his life.
On a more positive note, we have been stronger than ever since, but it did take a few months to rebuild our trust. If there is one piece of advice I can give you, it’s to cut the contact. If you love your wife, you should respect her feelings and put her first, I can guarantee this is not something that she will get over, it’s going to drive a wedge between you two and might even end your relationship. I know for sure, that if my partner did not end his friendship, I would have left.
I hope this helps.