Yeah, as others have said, she’s just done with this marriage. It also strikes me as odd that she wants to move out, at least in part, because she’s bored and has no friends. Moving out doesn’t fix that. And it’s 100% not YOUR job to help her find friends, or even to make her life exciting.
I can say from experience that opening up your marriage will NOT make anything better, at least not for you. Open marriages only work when the marriage is healthy and strong. Bringing additional people into an already damaged relationship is a recipe for that relationship to fail. If she wants to date other people, she should do it as a single person and allow you to heal and move on without her.
I’m sorry, it sucks, but it really sounds like she’s made up her mind and is just trying to act like she’s still trying to hold onto the marriage even though she’s done with it.