still_thinking's feed

I forgot if it was yaoi or shounen ai but it is bl. Anyway it starts out as the mc being part of the police and he interviews the ml who is a criminal (murderer I think). And the mc has black hair and the ml has blonde hair. And the ending is that the mc says to the ml that he never loved him and he was manipulating him the whole time and he stabs him and kills him. Thank you!