I have recently split and still processing things.
My now ex used to mention his ex quite a lot.
Some of the things that stick in my mind are:
Why don’t you go get your nails done with (his ex)
I’m going to (ex’s) house on Christmas Day (we had been together 6 months)
Why don’t you go to a Botox party with (his ex)
She makes loads of money she makes £400 a time doing hair extensions
Look what (ex) is giving me (large piece of furniture)
I came to his house and there was furniture she had given him
His ex posting memories on his time line years after split
I’ve never had something like that before in a relationship and have got our due to various reasons including issues around his ex/ him not listening to me/