Financial compatibility plays a huge role in determining the success of your relationship. First and foremost, try to communicate your doubts about the future with your partner. His financially irresponsible behavior can have negative consequences for the both of you. Secondly, remember that it is not your responsibility to fix your partner. If he does not see a problem in his behavior, or if he seems uninterested in bringing about that change, it is not your responsibility to force him to change.  You deserve to be with someone who gives due importance to factors which impact your future together.