Why do I miss someone who mistreated me?

Anonymous
I was in a long term situation with a guy I've come to understand is narcissistic. He and I started off supposedly in a relationship. However, he started being inconsistent and ghosting me. This went on for 3 years. Whenever I confronted him I was gaslighted and made to think it was something that I was doing wrong. I would believe him and question my sanity. Eventually, I got help and began to see his true colors. Later, I also learned he was in a relationship with a younger woman whom he flaunted about town.

Yet, as of today I am missing him again and how things were in the love bombming stage. He has reached out to me several times as I left him without explanation and suddenly. I am trying to maintain no contact.

I suppose I wonder why do I still have feelings for him and when will it end. I'm also a bit jealous of his now fiance. I stupidly visited her social media where she's posting all the designer luxury gifts he's bought her. It makes me again question myself. Maybe I was the problem in our relationship and maybe he has changed for her?
Why do I miss someone who mistreated me?
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