A similar thing, which I hesitate to call an EA, happened with W about 7 years ago. And 9 years ago she met up with an old BF without my pre-knowledge, and feelings were expressed. He did not reciprocate.
How did you deal with each time? Did you confront her? Was it swept under the rug, instead of working on the issues that caused her to reach out to these men?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!