My wife and I have been married for 13 years with two girls 8 and 12. We've had some ups and downs in our marriage. For me it has been mostly fine but she has been unhappy over the years, around typical marriage stuff like household chores, but also emotional intimacy. On several occasions she has contemplated divorce or expressed a desire to get her own place, however we always worked it out. 
Four years ago she mentioned that she had an intense crush on a woman and wanted an open marriage. At the time I was shocked and hurt and pretty much told her no. I thought maybe it was something that she was going through, and we never really talked about it again. Before that I had no idea she was interested in women. When we were dating she mentioned developing a crush on a friend when she was in her 20's and kissing her once. I guess I figured it was youthful exploration.
Recently though she has had another crush on a friend. She also started therapy and decided to come out as Bi I'm supportive of that, and would support her in whatever way she wants. She's come out to a few close friends. However she also wants to explore the physical side of her sexuality and be with a woman. I'm not really wild about that, but as a man I figured if she wanted to have a wild night and try it, fine. However in talking what she really wants is relationship with a woman that leads to something physical. Basically an open marriage. 
She says she prioritizes me and I'm her number one. Since she's embraced her sexuality our communication has greatly improved and sex life has gone from a 5 to a 10. However I brought up the idea of a 6 month trial separation so she can go explore this without me having to be so close to and deal with jealousy etc. She didn't want this and wants to continue our marriage. I do too, we are best friends - but its basically agree to the open ended idea of her having a girlfriend or go our separate ways.
We are in couples counseling and it has been a whirlwind of emotions. I'm pushing for her to slow down, but she feels like she brought it up 4 years ago and I've had plenty of time to consider it. She's been sexting on a forum (no pixs just dirty talk) and is now in touch with a woman an hour away. This women is also married and bi. My wife is hoping this can develop into a once a month thing if they are a good match. I feel like I'm in an emotional whirlwind, I have no desire to divorce but I'm not sure this situation is good for me. She won't be discouraged about exploring the physical side of her identity
Can this work? Anyone tried it?