Consequently, I should stop treating her like a wife.
Yes, that's exactly it. Don't be cold or indifferent, just lovingly detach. You mentioned having been through this, were you here on the forums before under a different name maybe?
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Just yesterday I was thinking of asking her if she was still going to go with me. Thanks to your reminder, I'm not going to ask her. I'm just going to put on my tux and go. Although, if she expects to go, what should I do? I was thinking if she expects to go, I can just say, "I didn't expect you to join me."
Yeah I think you're spot on. You go whether she goes or not. If she goes along then fine, but if she doesn't then that's fine too. If you want to say something to her then say something like "I'm going to that ball this evening, you're welcome to come along if you wish." In other words it's her decision, and you are going and having fun regardless of her choice.