Read the text message.
The 14 year old girl is his niece, Beau's daughter, Natalie, who would have been 14 at the time Hunter was " dating " Beau's wife..
That text message was from Hunter to Joe.
Hunter was complaining about Beau's wife saying Hunter created an unsafe environment for her kids.
It sounds like the girl didn't tell her mother, but the mother found out somehow, and called the therapist.
That's why she won't let her daughter " go out to visit ."
Plus the therapist should have reported it to the police.