Then again, that guy is quite strange. Even though he knows about her twisted personality, he hasn't changed his behaviour. Rather, doesn't it feel like he likes her more? Setsura assumed that Akito was just like the other guys out there. Who liked the docile and meek. Setsura thought that once he saw her for who she really was, he would leave her. But not only did he leave, he accepted everything about her. He has to put up a lot dating her, her bad personality aside. He has to deal with the shadows of his past.
People constantly after her life means he's always exposed to danger too. But, Setsura was reluctant to let him go too. Because of him, being in this foreign country wasn't so bad. Even at the start when she was still adjusting to everything.