I'm having issues with letting go and I don't know why even though they move on already

Hi!  Thanks so much for the question.  In the words of the great philosopher, Elsa, the Ice Queen, wouldn't it be great if it were so easy to “Let it go?” 

So many of us have trouble letting go of things from our past. Whether it’s pain, resentment, or a failed relationship, we get stuck in negative thought loops and obsessive spirals that are frustrating, sad, and can lead to depressive episodes.  

Rumination is a curious thing. It's like listening to a song you hate on repeat. That's what happens when we can let go of the past. We make sad stories play nonstop. The more we watch our life's movie, the more it hurts.

Also, a lot of people can't let go of the past because they don't appreciate their present.  Perhaps instead of thinking so much about the relationship and her, you should be living in the moment, looking for ways to take care of yourself, and generally celebrating what you do have.

I've found that people often miss being in a relationship more than they do the actual person they were with.  I also have noticed that people sometimes miss the idea of who they thought the person was or what they longed for in the relationship rather than the reality of what it was like.  Obviously, without asking more questions of you, it's hard to know if this fits - but perhaps you should ask yourself "what exactly am I missing?"

Have you put yourself out there in vulnerable ways in an attempt to meet someone new?  What are you doing differently now that you are single? What did you learn over the last year that you can now use if you were to find a new partner?  So many questions and opportunities for growth!

So, instead of staying stuck in a negative headspace about what you've lost, I encourage you to "let it go" by reminding yourself - by changing your inner monologue - that you are in a good space now, have things to offer someone new, and are going to be an even better partner than you were before!  And in the meantime, enjoy the freedom you have from single-ness.  After all, you get to do whatever you want whenever you want (within reason) and there's something pretty wonderful about that!

Thanks again for the question. Best of luck to you!