Seen this play out so many times.
You have an immature girl in love with a dominant man.
The abuse starts slowly and he keeps getting away with more and more.
That is until the day he goes too far. She snaps and goes public. The police get involved.
She spills the beans and he gets charged.
Not long afterwards, he becomes all apologetic and professes his love for her. "It will never happen again...."
Because she loves him, she wants to give him a chance. But she knows the police won't be happy.
Suddenly, a statement comes out that it was all a mistake/misunderstanding. She doesn't want to press charges.
The Police are helpless as they very rarely pursue "wasting Police time" with alleged abuse victims, as they know it won't actually help the victim.
As to this case:
I've heard they have said recording was just "role playing". If this was true, she would be wasting Police time. (read above why they won't charge)
This could be the new evidence United are referring to.
United cannot sack him without a conviction. But for publicity reasons, they (now) don't want him at the club.
So their only option is to get him to agree to leave. He is still a United player on full wages, so either a loan or sale is the best for both parties.
He only agrees to this because United use their publicity machine to declare him "innocent" and a "shame" he cannot stay.
Basically he was told agree or you're on your own. If you want to continue playing somewhere, this is your only option.
All stinks to high heaven...