My roo seems to calm down when he is able to see his favorite hen. Yours might be similar especially if he thinks he's bonded with her. Where roo crowings are concerned, roos seem to react to other roos' crowings, even if they were audio recordings from Youtube clips! I once triggered a series...
Not being able to see each other - I think that's the problem. Merely letting your roo see his favorite hen may allow peace on earth to reign. He won't have physical access to overbreed her but visual access might be good enough.
Somewhat of a similar experience here. When his favorite hen was taken away, my male roo crowed incessantly, as he probably suffered separation anxiety. Eventually his favorite hen started chirping away (jip-jip...jip-jip..jip-jip). I then used a separator, which some here also recommend - that...