I'm back in the house after a year of physical separation but I am in a seperate bedroom. She is in a serious MLC and currently dating OM #3 (10 years younger. I have detached fairly well but I do have a few questions

1) what sort of boundaries do I set. We agreed to maintain our current "visitation" schedule and she can go out with her BF when it's her nights and I can go out with my buddies when it's mine, but thats it.

2)I am doing my best "as if" becasue that would be a 180 compared to my prior blow ups.

3) We still talk like friends after a year. We can joke or laugh or whatever, with minimal fighting. Is that normal? Should I even be doing that in light of the fact she is seeing someone. How much interaction should I have with her. I've got the emotional wall up so I can fake it and I think she is probably faking it as well.

4) I'm not sure I really even want the marriage anymore. I'm trying to figure things out for myself as a single person. She is broken and I'm not sure she will come out of it for years. How do I conduct myself around her. It just seems natural to me to talk with her and crack jokes etc.