What's worse?

What's worse: a woman who is oblivious to what a man is doing to her mentally, emotionally and physically or a woman who knows a man is cheating on her and still sticks with him? I've known a lot of women who try to hold down that man that isn't good for her. He's not on her same level mentally or he tears her down or he has a woman and she doesn't mind being the chick on the side. Why is that? How does it get to the point? I never wanted to be the woman that said 'he would never cheat on me' or 'we are meant to be so it doesn't matter that he's acting this way now. Everything will work out'. I would always deem that girl foolish. A woman (and man for that matter) can't honestly say that their spouse will never cheat on them. They don't know that. That's where trust comes in. If you trust your spouse, you hope and trust that they won't cheat you but you can't say they won't. Those type of women would bother me until I got to a point in one relationship that I was saying  statements close to that. In one relationship, it wasn't he wouldn't cheat, it was 'I don't know what I would do if..." Life would end. Heart would crumble. Love as I knew would not have any existence in my future. To me, I turned into that chick. We love each other so the things that other women dealt with, I wouldn't. I was wrong----very wrong to the point that it turned out I was the other woman the entire time and had no clue. Big lesson learned for me and I'm happy to say that I learned from it and took the good and bad. What about the women who know they are the other chick and don't care? I met a girl some years ago that seemed to only date men with chicks. She said the same thing we've all heard. 'I'm sparing my feelings. I won't get hurt. It's just sex. He can't hurt me because he's not with me. What his chick don't know won't hurt her.' She said all of that so much that I nicknamed her 'The Mistress'. What made it worse was that she was proud of it. She didn't have any children. She was young. She thought she wasn't hurting anyone. I told her that karma is a mother and that is going to get her when she least expects. What is up with women not caring or making it a point to be the other woman? What will you get out of that? Do you think that what he's doing with you, he's not doing with his chick? Do you think that you are holding him down because he comes to yourself after the sun goes down? Do you think he cares, he truly cares about you? Why would you want to be his 5th because please believe, you are not the only one. He lives with her and lays in her bed but he likes you? I don't know which is worse.