If you pull it up the Bo character died in her arms of a brain tumor where he had grown so weak. Maybe they do a super villain comics plot where he didn't die and some villain led to his faked death . Where he's found alive and the 2 can leave together finally.
Actually I just kinda wrote a nice soap opera twist , Bo (who in reading was a major police investigator and traveled the world at times for bad guys) gets drugged to believe he's dying. Hope discovers it and unlike the other times where he was the macho cop deal , she discovers he's alive and being used ala Winter Soldier with his mind amnesia filled and corrupted.
So its her who finally breaks the spell. Bad guy is killed , Bo and her debate going back to Salem but decide to go into witness protection and never return to their old lives. Bo can joke he's now retired for good. The 2 get the sunset ending.