My WW and I are two months into a trial separation. It was suggested by our therapist. As far as pros are concerned, there have been several. In our situation, the environment at home had become toxic emotionally. Not in the sense of constant knock down drag out fights but the same emotionally charged disagreements set on repeat. It was incredibly unhealthy emotionally and some physical effects were beginning to creep in. The separation has provided a reprieve from that. In hindsight, it has allowed us to recover emotionally and at least for me, allowed me to heal to the point where I have a better perspective on life and the relationship.
The separation has also provided the space needed to detach in a healthy way so that we can focus on the personal work that each of us need to do. It was apparent that unlesswe made changes (both of us) as individuals, we would be just be repeating the old relationship patterns and it was pretty clear that didn't work previously. This process of individual work is still ongoing but it is already paying dividends. This time has also allowed us to better understand our own needs and feelings instead of trying to control one another which had become a problem in our relationship.
Ultimately, I think the separation will allow us to revisit whether or not to continue the relationship with a better perspective and clearer heads.
With regard to cons, there is definitely a downside to separation. The logistics can be tough especially with children involved. We have two that ironically are the same ages as yours. We sought the guidance of our therapist and came up with an elaborate system that works about as well as these things can. We rented an apartment near our house and we basically have a schedule where we alternate who stays at the house with the kids (they never go to the apartmemt) and who stays at the apartment. We spend Sundays together as a family and the person not at the house comes over for dinner every orther night. This way, we never go more than 2 days withoutbseeing the kids. There have been questions from the 5 yr old but weve explained that our work schedules have changed which was a suggestion of the therapist. This approach requires two things we are fortunate to have: resources to support two households and being good co-parents which we are.
Another con is the intense emotions you feel especially initially. The fear, anger, pain, etc seem to pour out early on for both people and by design, you have to deal with those alone by and large. There is a grieving process as well over the "old" relationship and likely wothdrawal for the WS if they have really gone NC. This part is tough but working through those emotions does give a sense of peace or at least it did for me. My wife struggled with not getting her emotional needs met pre-A so this was especially tough for jer to go through.
The uncertainty of how things will work out is also tough to manage. I think this gets to the other posters comment about how the WS uses the time apart. Prior to the separation, I was in full detective mode and it was how I discovered the A in the first place. I had to arrive at a place (it took a while) where I've realized that I cant control the choices my wife makes but only how I will deal with them. She has to decide what she wants and arrange her life to get it which is precisely what I'm trying to do. If the only way that will choose not to cheat is when I am constantly looking over her shoulder then we don't need to be together. I have communicated my expectations and boundaries and she can make her own choices without me trying to control her. I realized the continued police work was about me and my fear of looking like a fool if an A was going on under my nose. All it really did was make me crazy and create more fear. If she chooses to continue seeing the OM then my choice in all this got a lot easier about what to do long term.
Sorry for the long reply and stray words below (writing on a kindle isn't easy). The bottom line is that the separation has served a useful purpose for me (wife may not agree fully) but it isn't easy. Of course nothing dealing with relationships or an A ever is. To make separation work, you must be able to work together on logistics, money, and kids. Hope this was helpful.
The uncertainty of how things will turn out becomes very real when you no longer live together and this also has to be dealt with. schedule where