Why do I still think about my ex almost everyday and compare how I feel with other people to how I felt with him?

We broke up and he got back together with his ex, I hooked up with his best friend, it was a whole thing. I haven't spoken to him in months but I still dream about him and think about him almost everyday. I know it will never work out and I don't cry about him anymore, I don't think I'm sad anymore either... So I'm confused, why do I still think about him when it feels like I've moved on?

Additionally whenever I try to start a relationship with someone else, I compare how I felt with my ex. It feels like I'll never find something that good again because I can't seem to have feelings for anyone else.

What's going on?
Why do I still think about my ex almost everyday and compare how I feel with other people to how I felt with him?
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