Long story short. My partner has a child with his ex. They split up as she was cheating on him whilst he was in the military. His child was a toddler at the time. They haven't been together for years, and his child is now nearly 7. She adores him, they're attached at the hip, he pays his child maintenance without fail, and basically revolves his life around his daughter (which is one of the things I love about him). He's recently found out that his ex is thinking about moving away over 250 miles with his daughter and new boyfriend. My partner is heartbroken and a complete mess as his daughter is his works. It's like his world has been pulled from under him.
What are people's opinions on this? And is there anything at all he can do to prevent this from happening? I understand that adults want to move around and try new places, but is it really the best thing to take a daughter so far away from their parent?
Confused, lost, have no control over this. Any advice would be greatly appreciated.