Manny did not want to fight Horn, said it was his last fight with Top Rank

[rickJen]

Pacquaio is sick of Bobfather's constant pressure.
Not a convenient way for the Philippino fighter who just wants to fight
at his own schedule when he sees fit.
It must be like being pushed against your will. It's terrible.
He probably felt like he's a full time fighter, not a govt official.