Why history is such a bitch

Do you know why history is such a bitch? As in, in relationships. It's because they know you so well. you've gone so deep with them. Actually discovered parts of yourself talking to them. And it's not the same starting with a clean slate, the history's already there with that other person. And it takes a lot to get to that level of depth in the first place. Someone could be more compatible with you, but you don't care, all you can think about is that you've had this before, with someone else. And it was so good.