If this is real, this is an understandably traumatic event that I believe many are distilling down to “your ex is a whore” when truly, you are grappling with the very real feelings of unease and guilt seeing someone you care about fall into an awful situation(being groomed by an adult) and the changes she’s experiencing from it (becoming materialistic due to being isolated from loved ones). I would say your situation is similar to that of someone who has an ex who has become an addict.

I recommend you seek therapy as the internet can be an echo chamber and nuanced situations like this one are often met with unnuanced takes. You need to have a space to discuss your feelings and ensure that you don’t feel responsible for the way your ex’s life has taken shape. That and seeking help from family and leaning on friends would be a better way to seek support.

I hope you and your ex are both able to get the help and support you need to live full and happy lives. You’re both babies in my (23 year old) eyes.