How to stop thinking about my ex?

My ex husband and I have been divorced for 2 years, apart for over 4 years. I left him, I filed for divorce because I knew the relationship was toxic. We almost got back together once but I found out he was with someone else. When I confronted him about it, he said he wanted a life with me, but she enabled him to do drugs. His drug problem was a big part of why I left.

Now, I'm in a new relationship with a wonderful guy. We never fight, and he treats me really good. I can't stop thinking about my ex though.
How to stop thinking about my ex?
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