Right now, the car legally belongs to both of you, since you both signed for it. If you divorce, the divorce court will consider the car together with your other assets and decide who gets what, based on relative contributions, on need, on current income and ability to support yourselves, etc. Based on what you write, you may well get the car in a divorce, if you have paid more for it--but that's not a given, because the family court has discretion, or freedom and authority, to look at the broad picture of your relationship and finances in apportioning assets.