Tell him your fears and show him your hurt rather than your anger at him. And you always do what it right for you, what is true for you. And sooner than later he will be by your side. If your income allows, also fund a Roth IRA to the max. Do absolutely everything you can to put away money today for your tomorrows.
Time is the most important ingredient in a financial freedom recipe.
Also, buy your cars. It's not about making more money. It's about knowing more about the money you already make. But there is that money problem again. First of all, there are many student loan repayment programs that allow you to pay back the loan over a time period and a monthly payment plan that you can afford.