You’re always drawn back in
You want to leave a bad relationship. You have all the best intentions. You’ve identified the problems and you understand that you plus that person = bad news. And you confidently declare it’s over. But then, you’re faced with the prospect of being alone, and since you haven’t faced that fear and tackled it, you turn right back around, and stay in that bad relationship. You believe it’s better than being alone—you don’t know any better, since you’ve never tried being alone.