Legal Question in Civil Litigation in North Carolina

This was not very bright. Never ever get a vehicle with someone else if you are not married to them unless there are valid reasons for this (they are very few).

Since you are on the title, you are entitled to 1/2 of whatever the jeep is worth NOW. If she refuses to buy you yout, then you can seek what is called partition. Partition is more common for land but it is available for personal property as well. If neither will buy out the other, the car will be sold and the money will be split between you. Since the car is older, it has gone down in value and you will have legal and sale costs so there is going to be less to divide. See if you can appeal to your ex-girlfriend's greed instinct and get her to be reasonable.

Do not sign over your right in the vehicle until you have cash or a check in hand - no promissory notes. Once you sign over your rights to the car, they are gone and if she reneges on a promissory note, you will have to sue her to get your money and depending on her circumstances, you may end up with a worthless judgment. So if she wants the car, she has to give you your portion.