Ex-domestic partner abused my credit card!

[dsiegel]

What is the name of your state? California
I have recently gotten out a a domestic partnership. I am unfortunately now dealing with the consequences of her compulsive shopping habits. She had a long history of this before we got involved, so I suppose I should have been prewarned. Due to this history, she has horrible credit. We are both graduate students, so we're both not exactly rolling it in. When we were together, she used my credit card as she didn't have any. We had a verbal agreement that she would pay me back. However, due to her irresponsibility, lack of money, and our separating, I do not think I will see much if any of this money. Credit cards bills over the past several years on shipping accumulated to about $13000! And of course, it's all in my name. I am trying to slowly pay off something so my credit won't be too affected.
We had an agreement when we broke up that she would pay be every month a set sum but she rarely meets this amount. Every month, I end up having to call her constantly to get her to do anything. She tells me that she's taking out loans and taking on extra jobs to pay me, but still never gives me near the amount she promises. And it's always a battle every month to get anything out of her. We agreed that she would owe me the first of every month. But that NEVER happens. She always has some excuse, she's moving, traveling or something. If I try to explain to her that I need help and that this is her responsibility, she gets upset and angry with me. She just doesn't get it. She also doesn't have any concept of interest and that the longer she waits, the more she will pay.
I am willing to pay half, just to get this thing paid and her out of my life! But if I have to call her every month to nag her for the next 4-5 years, I might go crazy. But if I don't do this, I will end up having to pay it all which will take about 8-9 years.
My question is whether I can hold her legally responsible for any of this. The credit card was only in my name. It was not a joint card. Would it be worth suing? I have no experience with the legal system so have no concept of costs involved.
This is all costing me much monetary and emotional distress. Any help would be greatly appreciated.

[FarmerJ]

unless you can get her to admit in front of a judge or sign a written statement that she owes it so you can sue her in court , you might as well go get a second job and pay it off your self . its a expensive lesson since you allready know you arent going to get it from her easily.