Thanks for the advice LS, Mike & H. I agree that I should have given her advance notice. Does not matter because I doubt I will do it again. She is convinced that I went on a date and got laid, and this provides her proof that I will have a "soft landing" when she serves me with D papers.
Yes, Mike, she is indeed already gone. She is not having second thoughts. My going out on my own sent her the message that I have let her go completely, and she will likely file for divorce very soon, probably sooner than if I had not gone out last night.