H.T.
K., I am so happy that you have met a wonderful man and that you have a great relationship. The biggest piece of advice I can offer is that he needs to go to court to get visitation, etc. in writing, if he doesn't have any of that. If he and the ex were not married, then in the state of Arizona, a father does NOT have any legal right to the child, unless papers have been filed in court. To avoid any issues with her trying to withold his daughter from him, he needs to do that ASAP. I used to work for a Police Dept, and we would have so many heartbroken dads call in who had exes that were NOT good for the kids, and keeping their kids from them, and it's perfectly legal. That is the first thing he needs to do.
Hopefully the ex will come around...I know he can't just cut her out of his life, since they have a child together, but it sounds like YOU have the right mindset in this all, as far as Ariana is concerned, and you have reached out and tried to do the right thing. Good luck to you, and if you have any questions, feel free to send me a message. I will be thinking of you and I hope this all works out for the three of you! Keep us posted.
H.