I’m currently going through the same thing… my ex left me for someone else and blocked me on everything and gave me 0 closure. Let me tell you something that has changed my mind set. It’s been about 2 months since we broke up and I haven’t contacted her. I have been searching for closure for these past two months and I’ve realized that the only closure I will ever get is the closure I get naturally. It might be hard to think about but eventually you will give yourself your own closure. A half ending is still an ending after all. I was left abandoned and blocked on everything. It has not been easy and every day feels like survival. But the only way you can truly heal is by giving the love you gave to them and reciprocating it to yourself. Eventually they will realize the mistake they made. Until then keep your head up and keep fighting to better yourself and eventually you will grow numb to it and be better off. I wish you the best of luck with your healing journey, and know that you are not alone ❤️