it starts off as a distraction but honestly the best way is opening yourself up to finding love and fulfillment in other things/relationships (not always romantic!) Spend quality time with your friends and family, try new things like going to a new restaurant or cafe, maybe pick up a new hobby or hobby you previously left behind. As you make room for these new things, the space this person took up in you will naturally get smaller and less noticeable until you’ll realize you rarely think about how much you missed her.
I’m sorry you’re feeling this way but all things truly do pass 💕