Off topic from GLP's day-to-day current events, but this is an interesting article for those who are or have experienced retroactive jealousy in a relationship, something I'm currently going through with my gf. In my case, she's the one displaying signs of jealousy over my ex's which is ruining the relationship.
Retroactive jealousy: Obsessed with my partner’s past
"Most people don't like the idea of imagining their partner with someone else, such as an ex, but what I was feeling was entirely different.
My romantic history was, shall we say, more "colourful" than hers, but the thought she had been intimate with anyone other than me started plaguing me.
I didn't know the name of it then but what I had is sometimes called "retroactive jealousy". I'd learn much more about it in the years that followed.
I started playing mental movies in my head of her in situations with her ex and imagine them as if was happening in real time, right in front of me. It was as if she was cheating on me.
Her past suddenly became my present."
Less than 50%
[link to www.bbc.com (secure)