Before considering a separation, I always advise my clients to find answers to the following questions;
What did you value in the relationship?
Think about your earlier happy moments, and the things you will miss afterwards. You can inform them of what has made you choose to leave, perhaps because of what changed in the relationship. Let them understand that it will not add value staying because there is no longer love. The timing does not matter, as long as you are not happy, leaving the relationship even before Christmas serves better for both parties.
Do you remember what made you fall in love?
Review all the memories in the past, whether good or bad, and see if you can pick any remnants that may be revived. In case there is any, determine if it is worth staying.
What to do
Are you still choosing to leave and the holiday season is here? Staying can be tricky because it will always be linked to Christmas, especially when things completely fail to workout. It is best to develop a plan that helps keep your word. I recommend finding a strong support system that can offer a place or host you during the holidays.