Learn to value yourself again.
I have been single since my divorce in my early 30s - apart from a few short term relationships that really went nowhere.
You can suit yourself in choosing what you want to do or where you want to go , without having to ask anyone else's permission.
I have been on holiday on my own and to concerts and shows on my own - mainly because each time , none of my friends or family wanted to come with me or were interested !
Yes it may be lovely, walking along, holding hands once again but to me, that is more a feather in your cap as to how other people will be seeing you, than how you actually feel about the relationship!
Over the festive period, sit down and make plans for things you would like to do for the next year or so - if you have time to spare, volunteer for something and concentrate on making friends rather than romantic relations as one my lead to the other, if you wish.