I can email his co-workers without access to his inbox. I can pick up a phone, I can show up. Blocking me from access does not change that. Blocking me from access only creates a place where he can receive filthy joke emails from young female coworkers (which he has none now) and photographs of young female coworkers scantily clad from stupid male coworkers (of which he has none of those now either).

The relationship I intervened on was using me, my family's resources.

Telly, maybe you should go back to when he changed jobs and what HIS intention was in doing so. At least, his stated intention.

Marriage is the triumph of imagination over intelligence. Second marriage is the triumph of hope over experience.
(Oscar Wilde)