How do I move on?

Hey guys I am a 28F and my ex is 36M we dated for about 4 months and it was honestly the stupidest breakup ever, he literally left me on read, we had a great connection and amazing chemistry he was my best friend, my problem isn’t that, my problem is it’s been 8 months since we broke up and I can’t lie there hasn’t been one day where I haven’t cried and don’t think about him, the worst part is when I try and move on I am comparing everyone else to him and get uninterested so fast in the other party then I go home and cry bc I remember how much of a good time I used to have with my ex, please help me 😭 I’m trying so hard to move forward in my life because if he wanted too he would but he simply doesn’t want too