Well he can always fall off his boat and be presumed dead. Or he can have some kind of accident (like Kristen) or the MANY times Jack died.
Better, Hope is tired of this absentee relationship and gives him an ultimatum, He tells her his will return, but never show. She moves forward on the divorce and starts her new life. If Bo can’t return for his daughter and wife, he is dead as far as Hope is concerned.
That way she can have a life and the door still remains open. After a time, if he does return, he will see her happy with someone else.