If your fiance gives you a egagement ring that he is making payments on and later the relationship does not work out, do you have to return the ring?

As a general matter, an engagement ring is a conditional gift. The gift becomes complete upon marriage. If no marriage occurs, it remains the property of the donor. While some states vary this rule depending on the misconduct of the donor in causing the relationship to fail, the better rule is probably a "no fault" one where the ring must be returned.