I have a vehicle that is titled in my name and my ex boyfriends. I paid cash for this vehicle and it is insured by me.

Although it will be more difficult, I am not aware of any jurisdiction that would prevent you from representing yourself, even though it's not a small claims matter.  It may be difficult, however, to overcome the written title showing your ex-boyfriend as part owner, but he should at least pay half the insurance.  You should check whether, in the state in which the car is registered, an owner is required to insure a car which he/she is not driving.  If not, you should cancel the insurance.