I totally agree with everyone who said DO NOT go to the ex's for Christmas. Good ehell, that is a trainwreck just waiting for a place to happen!!! I'm sure he had all good intentions when he invited you, but what was he thinking??? Like you'd want to be there with him and his new girlfriend???
Nope. Skip that business. Enjoy a quiet YOU day. Do what YOU want to do.... If you really need company for Christmas, invite some friends over in the evening. I don't know about the rest of y'all, but at my house, things die off around 4 PM, and it would be really nice to have something to do in the evening other than falling asleep on the couch.
Spending Christmas with the new guy would be way too much pressure on both of you. I know I'd feel really uncomfortable with meeting a guy's entire family for the first time on a major holiday.
As for New Years, definitely mention meeting for drinks. Again, not sure what it's like where the rest of y'all live, but around here, if you don't make plans early, you're sitting home. Places sell tickets and once they're sold out, they're sold out. Restaurants only take reservations up to a certain time and a table can be very hard to get. So yes, ask him about meeting up for drinks or whatever you have in mind.
One added bonus -- you'll get a good idea of just how into you the new guy is. If he's still non-committal and can't give you an answer about New Years, well, that might be a good indicator of how he's feeling about your relationship
so far, and forewarned is forearmed.
Merry Christmas! Enjoy your day whatever you decide to do!