So Person B was spying on Person A, who is a supervillain, as an informant for Person C, who is A's nemesis. B got captured by A, who decided to 'keep' B, having them publicly enter into a fake relationship that could entertain the news/tabloids and so B could serve as pretty eye candy at events and such. A fell madly in love with B pretty early on. B is.....falling, but more slowly.