You have every right to be angry, but don't let it rule your emotions. You probably should try and detach emotionally from him (loving him from a distance). Hope this makes sense.
The email should be kept short and simple, IMHO:
"The wedding is on xxx at xxx. I will be getting them a gift on my own, but don't mind adding your name to the card. I will not be staying overnight, and have cancelled the room reservation."
Hope this helps some.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim