How do you remove an ex boyfriend's name from a car title?

It depends. Titles that have more than one name can read either "or" or "and." In other Words, it might read "Jane Smith and John Smith" or it might read "Jane Smith or John Smith."

If the Word "and" is used, both people have to sign the title in order for it to be changed. If the Word "or" is used, either person can sign.