Wrong love? =/

I have this friend. She is still in love with her ex and has hooked up with him a couple of times even though he's a jerk and he'll never treat her right. To my best friend who never understands her. Why is she still in love with him? Because, she is lonely, she just got dumped by her boyfriend(not the one we're talking about) and if you read my earlier posts, you'll know how empty it feels when someone so close to you leaves, and her ex- is kinda the rebound guy. But she then finds out she still has feelings for him, she thought she got over him, but there is still a tiny spark in her. And she gets more attached to him, and it's not about the rebounding anymore, she thinks about him, the memories she use to have with him, even though her whole body is telling her not to, she got hurt the last time, but she still wants him. Why though? Even though he's a jerk. She's thinking about all the fun times she had with him, how she had fallen for him, and how their relationship was so special, she doesn't want to think about how it ended, she's believing that maybe this time he won't be a jerk, he'll appreciate me, i'll be better, i know this time he wouldn't. She's tricking herself. She's used to all her friends telling her not to, she just ignores our warnings. I know how badly you dislike her, but try understanding her first. =)