Can I sue my ex girlfriend for money I loaned her to pay her bills?

Kathy and I lived trogether for 20+ years. We were engaged. ring and all. With the recession, she lost her job and I lost my Army & Navy Store and went right to work at a local store. Then we lost our Apt. She went to live with her daughter. And I to a studio Apt in a local Motel untrill I could save enought to rent an new apt for she and I, Her Unemployment ran out. She couldn't pay her Car insurance and cell phone bills. Because we were to be married, I wasn't worried about getting paid back. I told her I'd pay those bills for her. I did for more than 2.5 years. I paid $9,739. The last Car insurance payment was 10/1/12. We were in contact all the time, Phone,text and Lunch at Subway. I couldn't begin to save money for our new Apt because all the extra money I made went to paying her bills. She stopped answering my texts and calls just before Hurrican Sandy hit. Then throught My neice and her face book( she and Kathy's daughter grew up together) She saw the Kathy got married!