My two cents (and no, I wont make that joke again): if you want to stay in the house, stay in the house. Unless she's being completely spiteful, you should be able to say you want to stay there without having to give her reasons or excuses.
I probably wouldn't mention the 23 years thing, but a generic birthday card is always a nice touch. Ask yourself, is it something I would do for a (not necessarily close) friend?
It is sad to see all the new people here. I wish the best for all of them.
Me 43 W 38 M 5 T 7 SD20 S15, S13 with 1st W ILYBNILWY June 2010 Separation/Bomb July 2010 Divorce Feb 8, 2011