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Anniversaries are always tough, adn this is the anniversary of the part where I remember you finally seemed to let go and recognize that this was not all just a bad dream. for you, I suspect, the anniversary of driving her to the airport is the same as my own anniversary of meeting my ex at the courthouse to file the papers together. We were being friendly, amicable... but we were filing for DIVORCE! The first year's anniversary was important. It's been 15 years and I don't even remember what date it was.... come to think of it, my second wedding date might have been somewhere close to it... same season, you know?
You can expect anniversaries to bring on wistful feelings of wondering what might have been, wishing that ... hmmm, what? Wishing that the dreams you had might have been possible? Wishing that you'd not wasted so much time on impossible dreams? I don't know. It's odd, disconcerting. It throws you back into feeling like you're the only one in the world who feels this, you'll never be able to move one, etc., etc.
But you're right, every one of these little upsets passes quicker & quicker, and before you can say, "boo", you'll find an anniversary passing and not even remember it. You're halfway there. I hope you have a great time on your sabbatacal, and come back refreshed and interested in everything again... and totally happy that your ex is not around to mess things up with her moodiness!