I have been feeling very tense about a situation. First off I am a woman and I am married to a woman and my wife is bi-polar. I feel like I am on a roller coaster most days. The highest of highs or walking on eggshells.

Before I meet my wife she had a fling with a woman who is bisexual. The other lady was married at the time and I guess her husband was okay with this. I tried to not give it much thought because this happened before I even knew her and I didn't feel like it concerned me. And she never tried to hide it from me. This was around 4 years ago. My wife and I have been married almost 3 years now.

Fast forward to today. Recently I have noticed that this girl has been liking everything my wife posts to Facebook. I looked at her page because curiosity got the best of me and I have noticed my wife has been liking everything on her page as well. Mainly selfies that she posts trying to look hot. What really got me though is she had posted one of those memes that said something about wanting people to post pictures they have with her in them. My wife replied with a wow face emoji and underneath that the girl posted a laughing emoji. I know that this is referring to a pic they took several years ago when they were in bed together. It has just been eating away at me and I don't know how to bring it up her. I'm sure I will be at fault in her eyes because I was looking at this girls page. But my gut just didn't and doesn't feel right. I don't think they have seen each other or anything like that. But I still find this very inappropriate. My question is how should I address this situation? Or should I just let it go? I hate feeling like this. We are in our 40's and this seems very silly to me. We have an almost 3 year old daughter, a nice house, I am a stable person with a stable job that I have been in for 21 years now. Why would she risk everything for something so childish?