Why is my ex self destructing?

So long story short, broke up with ex 7 months ago after I found out he cheated, and he left me for the other woman.

When we first got together 5yrs ago, he was living in his car and doing dumb shit that would have seen him in jail if he continued. Fast forward to 18mths ago and he had gotten his security licence and was working 2x part time jobs, on decent money.

So why has he gone from 2x jobs in Jan to no jobs by July? Why is he going backwards so quickly and back to no income and most likely doing stupid shit again? I am worried about him but know he won't talk to me if I reach out. Regardless of what he did, I don’t want to see someone I love sabotage all their hard work. How is “the other woman/new gf” let him behave this way? Is this behaviour out of guilt and he is miserable, and punishing himself?

Thoughts?
Why is my ex self destructing?
Post Opinion