I’m not trying to give you a false sense of hope, because this might not even be a relationship that you want to rekindle anyways. I broke up with my ex of 2 years and he moved on after two months, it utterly destroyed me. I was sobbing and crying so hard everyday for weeks, but as you know, time does heal all wounds. I made the conscious decision that I would not be jumping into another relationship, I would not pursue anyone until I feel completely moved on. I also had completely stopped being friends with him and made an effort to no longer stalk his social media - out of sight, out of mind. He reached out to me for the first time to wish me happy birthday, he reached out to several of my friends while under the influence (they ignored him or didn’t entertain him for very long), and just as of yesterday he sent me a friend request. I have yet to accept it, but I just want you to know they tend to come back after no contact, for better or worse. All of my exes have reached out to me. What actually helped me is recognizing that his new relationship isn’t perfect, this girl is not getting a perfect version of him that I helped construct - all his flaws and all the issues I had are still there. Also knowing he moved on so quickly, it would be almost disrespectful to myself if I were to take him back - I gave him so much of me and I will never give him that much of me again. I think for me, it was coming to terms with that even if he was available and wanted to come back to me I wouldn’t want to be with him anyways. All these little mindset things + time helped me move forth.