This has happened with my T about a few things. In particular she said she "NEVER" does sessions longer than an hour . She said " that is just not how I work".
Fast forward a year and we now do at least one 2 hour session a month so I can reallt get deep into my abuse issues.

I think its just the natural evolution of a relationship. Trust grows.He may also have actually consulted his insurance about it bc he knew you needed the help. His insurance company may have told him what is or isnt ok.