Black spots and grey areas

By my principles, if you love someone, you accept all the differences between the both of you. You'll love every bit of him/her; good or bad traits, and you might even be able to turn bad ones into good ones. However, what would be considered as accepting? Understanding each other as if they were reading a book and making way for it, compromising for it, or just sticking to their opinions? I know the answer's trivial in most cases, but there are times where the other would be totally unreasonable/unpredictable/un-LIKE-THEM for you to actually like them, as a person even.

The key is, probably, that you'll probably find something wonderful/sweet that you never knew about them among all the arguments, all the nasty thoughts and after the storm has passed, both parties would just explain themselves and move along.