<prompt> Human: Ive been dating my girlfriend for 8 months and we both want to be serious. We havent talked about getting married, but we are both interested in marriage. She comes from a wealthy family and lives in her fathers second home. She wrecked her car and has been working hard to save up money to buy and new car and move out of her dads house. However she fell in love with a car that she cannot afford and her father is going to co-sign. I dont know what her budget is, but I know that she cannot afford the car bill, student loans, rent in her own place, and other bills. I told her that buying the nice car seems very irresponsible and that shes just setting herself up to be more dependent on her father. She responded that her decision doesnt effect me and is ignoring my concern. My question is; how much will her crummy financial decisions effect me? At what stages of relationships Marriage can her mistakes become my mistakes?  <response>: At what stages of relationships Marriage can her mistakes become my mistakes?Either when you move in together or when you say I do, whichever comes first.how much will her crummy financial decisions effect me?Depends on how rich her family is and how long they plan on supporting her. You should have that talk with her. You and she needs to know how long her family plans on supporting her and if when you do get married, will she continue to get subsidized or do you inherit her debts. 