<human>: Can you condense the text into a few key points?

This isn't really about me, more my ex, who i'm still good friends with has been dumped for the 8th time by a guy who she's been on and off with for the past 9 months or so. 
I'm trying to explain that she should get over him using rational means and a realistic assessment of her relationship.
Unfortunately she is saying that she feels as if even though he hurts her so much and so often that he's the only one that can make her happy.
My question i guess is, how do i convince her to move on so that she can finally have some consistent happiness in her life?
<bot>: My ex who is still a very good friend of mine won't get over a jerk who constantly dumps her, so how can i convince her that he's not worth it?