I'm so very sorry to read your story! Looks like this is your first post here on this forum. So firstly I would like to welcome you. This is a place where you will not be judged, but will be accepted, acknowledged and appreciated for the person you are.
It must be very hard to think of your ex partner now being with someone else. Times like Christmas and New Years can be difficult.
You mentioned family and going out with friends. Could you try to become involved in family plans for Christmas this year? Do you have family members or friends who might like to bake with you? You could make it a real fun thing to do with a small group of people.
Is it possible to come up with something totally different to do for Christmas? One year we decided to have a picnic lunch in a park with my husband's family. Once there we had to fight for space! So many other people were doing the same thing!
Maybe this year it might be beneficial to get away and go somewhere else. The thing is though, your thoughts and emotions will go with you!
I realise that myself. We are going to Bali for Christmas. It will still be my same brain with the same memories and emotions tagging along with me. I need to find ways to deal with those thoughts and emotions.
I'm seeing my Dr next week to have a chat with him about it all. I have also expressed my negative thoughts and emotions regarding Christmas here, and it has helped.
If you do go away, make sure you can still contact family and friends. Going away is good, but isolating yourself might not be so healthy.
Cheers for now from Mrs. D