Why do some guys 'downgrade' after breaking up with their girlfriend?

Anonymous
Hey guys, just wondering about this as my ex boyfriend recently got a new girlfriend after a week of the break up (possibly a rebound) but she is severely over weight and has several mental health issues with anger management as well as moving in and out of hospital due to it. My main question being why do some guys (not all) down grade from their previous girlfriend when in a rebound relationship?

Also be aware that my ex is very charismatic and could have had any kind of very young and attractive girl.

This also happened to two of my other girl friends with their ex's and was also wondering if it is a trend or just us.

Thanks in advance xx
Updates
+1 y
My ex and I also dated appropriately three years before ending the relationship.
Why do some guys 'downgrade' after breaking up with their girlfriend?
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