OK. I already mentioned that I'm preparing a longer post about it, but I didn't brag about it:
Despite being left by my wife for a younger guy after 15 years and 4 children I have acted sensible, rational you might say, and bought a house, negotiated a fair marriage contract (separation of property), completed a much overdue freelance project and cared for the children a lot. I didn't break. I didn't hate. I didn't run away. I think I succeeded in saving my sanity (salvaging instead of destroying emotions from the relationship), providing a dependable, caring and safe environment for the children now and in the future (the house is on the other side of the street). And get along well with my future ex-wife and her new partner and avoid alienation of her by family and friends.
Actually all of that didn't happen in December but it is effectively done now. The children moved into the new house on Jan, 1st and all paperwork and such is done.
That is a hard thing you've done well. For all the people who will never thank you for this, I thank you.
As in Joshua Blaine's original description (below), but may be used to brag about things you've accomplished either this month (January) or the previous one (December), assuming that you haven't brought it up in any earlier Monthly Bragging Thread.