I have proceeded quite a way in my current writing venture, and have come into a problem that has made it difficult to keep writing/trudging on... The issue is that the love interest of the protagonist is going to be revealed as an antagonist as the story progresses. As I have some idea of the horrible things he has done, I am finding it hard to portray the initial/unblemished persona of the character. I don't want to set up a blatant hero/villain conflict, the story greatly involves the idea of how to love someone who has done terrible things, but is still human after all. So my question is this: How can I recapture the good stuff about the character without letting my knowledge about the past colour the way I write him now?