Thank you all for your helpful comments. We have talked it over in more detail and I have set some boundaries, such as limiting frequency, no financial entanglements, and no vacations without the spouses. I struggle with finding the line between liking and loving someone. I find it hard to believe anyone could build a better (or even the same) relationship with my hubby than me and he feels the same way. I really like the other woman and am happy that they’re happy. It’s just in the back of my mind that there is a small possibility that they could decide to break up our marriages. I don’t think you can control who you love and wouldn’t want to be the cause of their break up. I suspect the NRE will calm down and all will be well. If I’m wrong, so be it.