Well, she did calm down. Couple of weird moments though. She asked me if I wanted to stay living here as roomates, instead of selling the house. Weird question. Then, a little bit later, she said, "we can stay married.". I said yeah, but a lot of things would have to be worked on and a lot of things would have to change. She said yEah, for starters, I would want this to be an open marriage. So, I laughed and said, well, not really going to work for me. She says yeah, figured you'd say that, just thought I'd ask.
So, pretty calm after that. Now, what do I do?
CG,
Why would you laugh at such a disrespectful comment? Better to just stare at her, incredulously, and say "Wow. Unbelievable." or something similar.
What you do now is prepare to enforce the next boundary, because she's about to test you again. I assume this will be the "talking loudly to OM on her cellphone in front of you" thing. How are you going to handle that?
Fortunately, I didn't have this big of a problem with my wife. She pretty much respected my boundaries (no talking to OM from within our home; no texting him or talking to him ANYWHERE in front of me and the kids; if you're going to come home that late (after 1am), don't bother coming home," etc.). And she NEVER would have blatantly disrespected me with the "open marriage" joke.
Puppy
Unfortunately, I think your wife is so used to walking on you that you're going to have a series of tests here in the short-term that you're going to have to handle.